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´╗┐Title: Tom Swift Among the Diamond Makers, or, the Secret of Phantom Mountain
Author: Appleton, Victor [pseud.]
Language: English
As this book started as an ASCII text book there are no pictures available.

*** Start of this LibraryBlog Digital Book "Tom Swift Among the Diamond Makers, or, the Secret of Phantom Mountain" ***



The Secret of Phantom Mountain








"Well, Tom Swift, I don't believe you will make any mistake if you buy
that diamond," said the jeweler to a young man who was inspecting a
tray of pins, set with the sparkling stones. "It is of the first water,
and without a flaw."

"It certainly seems so, Mr. Track. I don't know much about diamonds,
and I'm depending on you. But this one looks to be all right."

"Is it for yourself, Tom?"

"Er--no--that is, not exactly," and Tom Swift, the young inventor of
airships and submarines, blushed slightly.

"Ah, I see. It's for your housekeeper, Mrs. Baggert. Well, I think she
would like a pin of this sort. True, it's rather expensive, but--"

"No, it isn't for Mrs. Baggert, Mr. Track," and Tom seemed a bit

"No? Well, then, Tom--of course it's none of my affair, except to sell
you a good stone, But if this brooch is for a young lady, I can't
recommend anything nicer. Do you think you will take this; or do you
prefer to look at some others?"

"Oh, I think this will do, Mr. Track. I guess I'll take--"

Tom's Words were interrupted by a sudden action on the part of the
jeweler. Mr. Track ran from behind the showcase and hastened toward the
front door.

"Did you see him, Tom?" he cried. "I wonder which way he went?"

"Who?" asked the lad, following the shopkeeper.

"That man. He's been walking up and down in front of my place for the
last ten minutes--ever since you've been in here, in fact, and I don't
like his looks."

"What did he do?"

"Nothing much, except to stare in here as if he was sizing my place up."

"Sizing it up?"

"Yes. Getting the lay of the land, so he or some confederate could
commit a robbery, maybe."

"A robbery? Do you think that man was a thief?"

"I don't know that he was, Tom, and yet a jeweler has to be always on
the watch, and that isn't a joke, either, Tom Swift.  Swindlers and
thieves are always on the alert for a chance to rob a jewelry store,
and they work many games."

"I didn't notice any particular man looking in here," said Tom, who
still held the diamond brooch in his hand.

"Well I did," went on the jeweler. "I happened to glance out of the
window when you were looking at the pins, and I saw his eyes staring in
here in a suspicious manner. He may have a confederate with him, and,
when you're gone, one may come in, and pretend to want to look at some
diamonds. Then, when I'm showing him some, the other man will enter,
engage my attention, and the first man will slip out with a diamond
ring or pin. It's often done."

"You seem to have it all worked out, Mr. Track," observed the lad, with
a smile. "How do you know but what I'm in with a gang of thieves, and
that I'm only pretending to want to buy a diamond pin?"

"Oh, I guess I haven't known you, Tom Swift, ever since you were big
enough to toddle, not to be sure about what you're up to. But I
certainly didn't like the looks of that man. However, let's forget
about him. He seems to have gone down the street, and, after all,
perhaps I was mistaken. Just wait until I show you a few more styles
before you decide. The young lady may like one of these," and the
jeweler went to another showcase and took out some more trays of

"What makes you think she's a young lady, Mr. Track?" asked the lad.

"Oh, it's easy guessing, Tom. We jewelers are good readers of
character. I can size up a young fellow coming in here to buy an
engagement or a wedding ring, as soon as he enters the door. I suppose
you'll soon be in the market for one of those, Tom, if all the reports
I hear about you are true--you and a certain Mary Nestor."

"I--er--I think I don't care for any of these pins," spoke Tom,
quickly, with a blush. "I like the first lot best. I think I'll take
the one I had in my hand when that man alarmed you. Ha!  That's odd!
What did I do with it?"

Tom looked about on the showcase, and glanced down on the floor. He had
mislaid the brooch, but the jeweler, with a laugh, lifted it out of a
tray a moment later.

"I saw you lay it down," he said. "We jewelers have to be on the watch.
Here it is. I'll just put it in a box, and--"

With an exclamation, Mr. Track gave a hasty glance toward his big show
window. Tom looked up, and saw a man's face peering in.  At the sight
of it, he, too, uttered a cry of surprise.

The next instant the man outside knocked on the glass, apparently with
a piece of metal, making a sharp sound. As soon as he heard it, the
jeweler once more sprang from behind the showcase, and leaped for the
door crying:

"There's the thief! He's trying to cut a hole through my show window
and reach in and get something! It's an old trick. I'll get the police!
Tom, you stay here on guard!" and before the lad could utter a protest,
the jeweler had opened the door, and was speeding down the street in
the gathering darkness.

Tom stared about him in some bewilderment. He was left alone in charge
of a very valuable stock of jewelry, the owner of which was racing
after a supposed thief, crying:

"Police! Help! Thieves! Stop him, somebody!"

"This is a queer go," mused Tom. "I wonder who that man was? He looked
like somebody I know, and yet I can't seem to place his face. I wonder
if he was trying to rob the placer Maybe there's another one--a
confederate--around here."

This thought rather alarmed Tom, so he went to the door, and looked up
and down the street. He could see no suspicious characters, but in the
direction in which the jeweler was running there was a little throng of
people, following Mr. Track after the man who had knocked on the window.

"I wish I was there, instead of here," mused the lad. "Still I can't
leave, or a thief might come in. Perhaps that was the game, and one of
the gang is hanging around, hoping the store will be deserted, so he
can enter and take what he likes."

Tom had read of such cases, and he at once resolved that he would not
only remain in the jewelry shop, but that he would lock the door, which
he at once proceeded to do. Then he breathed easier.

The town of Shopton, in the outskirts of which Tom lived with his
father, and where the scene above narrated took place, was none too
well lighted at night, and the lad had his doubts about the jeweler
catching the oddly-acting man, especially as the latter had a good

"But some one may head him off," reasoned Tom. "Though if they do catch
him, I don't see what they can prove against him. Hello, here I am
carrying this diamond pin around. I might lose it.  Guess I'll put it
back on the tray."

He replaced in the proper receptacle one of the pins he had been
examining when the excitement occurred.

"I wonder if Mary will like that?" he said, softly. "I hope she does.
Perhaps it would be better if she could come here herself and pick out

Tom's musing was suddenly interrupted by a sharp tattoo on the glass
door of the jewelry shop. With a start, he looked up, to see staring in
on him the face of the man who had been there before--the man of whom
the jeweler was even then in chase.

"Why--why----" stammered Tom.

The man knocked again.

"Tom--Tom Swift!" he called. "Don't you know me?"

"Know you--you?" repeated the lad.

"Yes--don't you remember Earthquake Island--how we were nearly killed
there--don't you remember Mr. Jenks?"

"Mr. Jenks?"

Tom was so startled that he could only repeat words after the strange
man, who was talking to him from outside the glass door.

"Yes, Mr. Jenks," was the reply. "Mr. Barcoe Jenks, who makes diamonds.
I saw you in the store about to buy a diamond--I wanted to tell you not
to--I'll give you a better diamond than you can buy--I just arrived in
this place--I must have a private talk with you--Come out--I'll share a
wonderful secret with you."

A flood of memory came to Tom. He did recall the very strange man who
walked around Earthquake Island--where Tom and some friends had been
marooned recently--walked about with a pocketful of what he said were
diamonds. Now Barcoe Jenks was here.

"I must see you privately, Tom Swift," went on Mr. Jenks, as he once
more tapped on the glass. "Don't waste money buying diamonds, when you
and I can make better ones. Where can I have a talk with you? I--" Mr.
Jenks suddenly looked down the dimly-lighted street. "They're coming
back!" he cried. "I don't want to be seen. I'll call at your house
later to-night--be on the watch for me--until then--good-by!"

He waved his hand, and was gone in an instant. Tom stood staring at the
glass door. He hardly knew whether to believe it or not--perhaps it was
all a dream.

He pinched himself to make sure that he was awake. Very substantial
flesh met his thumb and finger, and he felt the pain.

"I'm awake all right," he murmured. "But Barcoe Jenks here--and still
talking that nonsense about his manufactured diamonds. I think he must
be crazy. I wonder--"

Once more the lad's musing was interrupted. He heard a murmur of
excited voices outside the store, on the street. Then the door of the
jewelry shop was tried. Mr. Track's face was pressed against the glass.

"Open the door! Let me in, Tom!" he called. "I've caught the thief,"
and as the lad unlocked the portal he saw that the jeweler held by the
arm a ragged lad. "Ah; you scoundrel! I've caught you!" cried the
diamond merchant, shaking the small chap, while Tom looked on, more
mystified than ever.



While Mr. Track, the jeweler, and several citizens, attracted by the
chase after the supposed thief, are crowded into the store, anxious to
hear explanations of the strange affair, I will take the opportunity to
tell you something of Tom Swift, the lad who is to figure in this story.

Many of you have already made his acquaintance, when he has been
speeding about in his airship or fast electric runabout, and to others
we will state that our hero first made his bow to the public in the
book called "Tom Swift and His Motor-Cycle," the initial volume of this

In that story there was related how Tom made the acquaintance of an odd
individual, named Mr. Wakefield Damon, who was continually blessing
himself, some part of his anatomy, or his possessions. Mr. Damon was
riding a motor-cycle, and it started to climb a tree, to his pain and
fright. Afterward Tom purchased the machine, and had many adventures on
it, including a chase after a gang of men who had stolen a valuable
patent model belonging to Mr. Swift.

Mr. Swift, and his son were both inventors. They lived together in a
fine house in the suburbs of Shopton, New York, and with them dwelt
Mrs. Baggert, the housekeeper (for Tom's mother was dead), and also
Garret Jackson, an expert engineer, who aided the young inventor and
his father in perfecting many machines.

There was also another semi-member of the household, to wit, Eradicate
Sampson, an eccentric colored man, who owned a mule called Boomerang.
Eradicate did odd jobs around the place, and the mule assisted his
owner--that is when the mule felt like it.

In the second volume of the series, entitled "Tom Swift and His
Motor-Boat," there was related the incidents following a pursuit after
a gang of unprincipled men, who sought to get Possession of some of Mr.
Swift's patents, and it was while in this boat that Tom, his father,
and a friend, Ned Newton, rescued from Lake Carlopa a Mr. John Sharp,
who fell from his burning balloon. Mr. Sharp was a skilled aeronaut,
and after his recovery he joined Tom in building a big airship, called
the Red Cloud. Tom's adventures in this craft are set down in detail in
the third volume of the series, called "Tom Swift and His Airship." Not
only did he and Mr. Sharp and Mr. Damon make a great trip, but they
captured some bank robbers, and incidentally cleared themselves from
the imputation of having looted the vault of seventy-five thousand
dollars, which charge was fostered by a certain Mr. Foger, and his son
Andy, who was Tom's enemy.

Not satisfied with having conquered the air, Tom and his father set to
work to gain a victory over the ocean. They built a boat that could
navigate under water, and, in the fourth book of the series, called
"Tom Swift and His Submarine Boat," you will find an account of how
they went under the ocean to secure a sunken treasure, and the fight
they had with their enemies who sought to get it away from them. They
went through many perils, not the least of which was capture by a
foreign warship.

In the fifth book, entitled "Tom Swift and His Electric Runabout,"
there was told the story of a wonderfully speedy electric automobile
the young inventor constructed, and how he made a great race in it, and
saved from ruin a bank, in which his father and Mr. Damon were

Tom's ability as an inventor had, by this time, become well known. One
day, as related in a volume called "Tom Swift and His Wireless
Message," he received a letter from a Mr. Hosmer Fenwick, of
Philadelphia, asking his aid in perfecting an airship which the
resident of the Quaker City had built, but which would not work. In his
small monoplane, the Butterfly, Tom and Mr. Damon went to Philadelphia,
as Mr. Damon was acquainted with Mr. Fenwick.

Tom carefully inspected the Whizzer which was the name of Mr. Fenwick's
airship, and, after some difficulties, succeeded in getting the
electric craft in shape to make a flight.

Tom, Mr. Damon and Mr. Fenwick started to make a trip to Cape May in
the Whizzer, but were caught in a terrific storm, and blown out to sea.
The wind became a hurricane, the airship was disabled, and wrecked in
mid-air. When it fell to earth it landed on one of the small West
Indian islands, but what was the terror of the three castaways to find
that the island was subject to earthquake shocks.

But the earth-tremors were not the only surprise in store for Tom and
his two friends, On the island they found five men and two ladies, who,
by strange chance, had been stranded there when the yacht Resolute,
owned by Mr. George Hosbrook, was wrecked in the same storm that
disabled the airship. Mr. Hosbrook, a millionaire, was taking a party
of friends to the West Indies.

When the castaways (among whom were Mr. and Mrs. Amos Nestor, parents
of Mary Nestor, a girl of whom Tom was very fond) found that there was
danger of the island being destroyed in an earthquake, they were in
despair. There seemed no way of being rescued, as the island was out of
the line of regular ship travel.

Tom, however, was resourceful. With the electrical apparatus from the
wrecked airship, he built a wireless plant, and sent messages for help,
broadcast over the ocean.

They were finally heard, and answered, by an operator on board the
steamer Camberanian, which came on under forced draught, and rescued
Tom and his friends. It was only just in time, for, no sooner had they
gotten aboard the steamer in lifeboats, than the whole island was
destroyed by an earthquake shock.

But Tom, the parents of Mary Nestor, Mr. Damon, Mr. Fenwick, and all
the others, got safely home. Among the survivors from the yacht
Resolute was a Mr. Barcoe Jenks, who now, most unexpectedly, had
confronted Tom through the glass window of the jewelry store. Mr. Jenks
was a peculiar man. Tom discovered this on Earthquake Island. Mr. Jenks
carried with him some stones which he said were diamonds. He asserted
that he had made them, but Tom did not know whether or not to believe

When it seemed that the castaways would not be saved Mr. Jenks offered
Tom a large sum in these same diamonds for some plan whereby he might
escape the earthquakes. Mr. Jenks said there was a certain secret in
connection with the manufactured diamonds that he had to solve--that he
had been defrauded of his rights--and that a certain Phantom Mountain
figured in it. But Tom, at that time, paid little attention to Mr.
Jenks' talk. The time was to come, however, when he would attach much
importance to it.

When this story opens, Tom was more interested in Mr. Barcoe Jenks than
in any one else, and was wondering what he wanted to see him about. The
young inventor could not quite understand how Mr. Track, the jeweler,
could come back with a lad he suspected of being a thief, when the
person who had acted so suspiciously, and who had knocked on the glass,
was the queer man, Mr. Jenks.

"Yes, Tom I caught him," the jeweler went on. "I chased after him, and
nabbed him. It was hard work, too, for I'm not a good runner. Now, you
little rascal, tell me why you tried to rob my store?" and the diamond
merchant shook the lad roughly.

"I--I didn't try to rob your store," was the timid answer.

"Well, perhaps you didn't, exactly, but your confederates did.  Why did
you rap on the glass, and why were you staring in so intently?"

"I wasn't lookin' in."

"Well, if it wasn't you, it was some one just like you. But why did you
run when I raced down the street?"

"I--I don't know," and the lad began to snivel. "I--I jest ran--that's
all--'cause I see everybody else runnin', an' I thought there was a

"Ha! That's a likely story! You ran because you are guilty! I'm going
to hand you over to the police."

"Did he get anything, Mr. Track?" asked one of the men who had joined
the jeweler in the chase.

"No, I can't say that he did. He didn't get a chance. Tom Swift was in
here at the time. But this fellow was only waiting for a chance to
steal, or else to aid his confederates."

"But, if he didn't take anything, I don't see how you can have him
arrested," went on the man.

"On suspicion; that's how!" asserted Mr. Track. "Will some one get me a

"I wouldn't call a constable," said Tom, quietly.

"Why not?"

"Because that isn't the person who looked in your window."

"How do you know, Tom?"

"Because that person came back while you were out. I saw him."

"You saw him? Did he try to steal any of my diamonds, Tom?"

"No, I guess he doesn't need any."

"Why not?" There was wonder in the jeweler's tone.

"Why, he claims he can make all he wants."

"Make diamonds?"

"So he says."

"Why, he must be crazy!" and Mr. Track laughed.

"Perhaps he is," admitted Tom, "I'm only telling you what he says. He's
the person who acted so suspiciously. He came back here, I'm telling
you, while you were running down the street, and spoke to me."

"Oh, then you know him?" The jeweler's voice was suspicious.

"I didn't at first," admitted Tom. "But when he said he was Mr. Barcoe
Jenks, I remembered that I had met him when I was cast away on
Earthquake Island."

"And he says he can make diamonds?" asked Mr. Track.

"What did he want of you?" and the jeweler looked at Tom, quizzically.

"He wanted to have a talk with me," replied the lad, "and when he saw
me in your store, he tried to attract my attention by knocking on the

"That's a queer way to do," declared Mr. Track. "What did he want?"

"I don't know exactly," answered Tom, not caring to go into details
just then. "But I'm sure, Mr. Track, that you've got the wrong person
there. That lad never looked in the window, nor knocked on the glass."

"That's right--I didn't," asserted the captive.

The jeweler looked doubtful.

"Why did you run?" he asked.

"I told you, I thought there was a fire."

"That's right, I don't believe he's the fellow you want," put in
another man. "I was standing on the corner, near White's grocery store,
and I noticed this lad. That was before I heard you yelling, and saw
you coming, and then I joined in the chase.  I guess the man you were
after got away, Track."

"He did," asserted Tom. "He came back here, a little while ago, and he
ran away just now, as he heard you coming."

"Where did he go?" asked the jeweler, eagerly.

"I don't know," answered Tom. "Only you've got the wrong lad here."

"Well, perhaps I have," admitted the diamond merchant. "You can go,
youngster, but next time, don't run if you're not guilty."

"I thought there was a fire," repeated the lad, as he hurriedly slipped
through the crowd in the store, and disappeared down the dark street.

"Well, I guess the excitement's all over, and, anyhow, you weren't
robbed, Track," said a stout man, as he left the store.  The others
soon followed, and Tom and the jeweler were once more alone in the shop.

"Can you tell me something about this man, Tom?" asked Mr. Track,
eagerly. "So he really makes diamonds. Who is he?"

"I'd rather not tell--just now," replied the young inventor. "I don't
take much stock in him, myself. I think he's visionary. He may think he
has made diamonds, and he may have made some stones that look like
them. I'm very skeptical."

"If you could bring me some, Tom, I could soon tell whether they were
real or not. Can you?"

The lad shook his head.

"I don't expect to see Mr. Jenks again," he said. "He talked rather
wildly about waiting to meet me, but that man is odd--crazy,
perhaps--and I don't imagine I'll see him. He's harmless, but he's
eccentric. Well, there was quite some excitement for a time."

"I should say there was. I thought it was a plan to rob me," and the
jeweler began putting away the diamond pins. In fact, the excitement so
filled the minds of himself and Tom that neither of them thought any
more of the object of the lad's visit, and the young inventor departed
without purchasing the pin he had come after.

It was not until he was out on the street, walking toward his home,
that the matter came back to his mind.

"I declare!" he exclaimed. "I didn't get that pin for Mary, after all!
Well, never mind, I have a week until her birthday, and I can get it

He walked rapidly toward home, for the weather looked threatening, and
Tom had no umbrella. He was musing on the happenings of the evening
when he reached his house. His father was out, as was Garret Jackson,
the engineer; and Mrs. Baggert, the housekeeper, was entertaining a
lady in the sitting-room, so, as Tom was rather tired, he went directly
to his own room, and, a little later got into bed.

It was shortly after midnight when he was awakened by hearing a
rattling on the window of his room. The reason he was able to fix the
time so accurately was because as soon as he awakened he pressed a
little electric button, and it illuminated the face of a small clock on
his bureau. The hands pointed to five minutes past twelve.

"Humph! That sounds like hail!" exclaimed Tom, as he arose, and looked
out of the casement. "I wonder if any of the skylights of the airship
shed are open? There might be some damage. Guess I'd better go out and
take a look."

He had mentally reasoned this far before he had looked out, and when he
saw that the moon was brightly shining in a clear sky, he was a bit

"Why--that wasn't hail," he murmured. "It isn't even raining. I wonder
what it was?"

He was answered a moment later, for a shower of fine gravel from the
walk flew up and clattered against the glass. With a start, Tom looked
down, and saw a dark figure standing under an apple tree.

"Hello! Who's there?" called the lad, after he had raised the sash.

"It's I--Mr. Jenks," was the surprising answer.

"Mr. Jenks?" repeated Tom.

"Yes--Barcoe Jenks, of Earthquake Island."

"You here? What do you want?"

"Can you come down?"

"What for?"

"Tom Swift, I've something very important to tell you," was the answer
in a low voice, yet which carried to Tom's ears perfectly.  "Do you
want to make a fortune for yourself--and for me?"

"How?" Tom was beginning to think more and more that Mr. Jenks was

"How? By helping me to discover the secret of Phantom Mountain, where
the diamonds are made! Will you?"

"Wait a minute--I'll come down," answered Tom, and he began to grope
for his clothes in the dim light of the little electric lamp.

What was the secret of Phantom Mountain? What did Mr. Jenks really
want? Could he make diamonds? Tom asked himself these questions as he
hastily dressed to go down to his midnight visitor.



"Well, Mr. Jenks," began Tom, when he had descended to the garden, and
greeted the man who had acted so strangely on Earthquake Island, "this
is rather an odd time for a visit."

"I realize that, Tom Swift," was the answer, and the lad noticed that
the man spoke much more calmly than he had that evening at the jewelry
shop. "I realize that, but I have to be cautious in my movements."


"Because there are enemies on my track. If they thought I was seeking
aid to discover the secret of Phantom Mountain, my life might pay the

"Are you in earnest, Mr. Jenks?"

"I certainly am, and, while I must apologize for awakening you at this
unseemly hour, and for the mysterious nature of my visit, if you will
let me tell my story, you will see the need of secrecy."

"Oh, I don't mind being awakened," answered Tom, good-naturedly, "but I
will be frank with you, Mr. Jenks. I hardly can believe what you have
stated to me several times--that you know how diamonds can be made."

"I can prove it to you," was the quiet answer.

"Yes, I know. For centuries men have tried to discover the secret of
transmuting base metals into gold, and how to make diamonds by chemical
means. But they have all been failures."

"All except this process--the process used at Phantom Mountain,"
insisted the queer man. "Do you want to hear my story?"

"I have no objections."

"Then let me warn you," went on Mr. Jenks, "that if you do hear it, you
will be so fascinated by it that I am sure you will want to cast your
lot in with mine, and aid me to get my rights, and solve the mystery.
And I also want to warn you that if you do, there is a certain amount
of danger connected with it."

"I'm used to danger," answered Tom, quietly. "Let me hear your story.
But first explain how you came to come here, and why you acted so
strangely at the jewelry store."

"Willingly. I tried to attract your attention at the store, because I
saw that you were going to buy a diamond, and I didn't want you to."

"Why not?"

"Because I want to present you with a beautiful stone, that will answer
your purpose as well or better, than any one you could buy. That will
prove my story better than any amount of words or argument. But I could
not attract your attention without also attracting that of the jeweler.
He became suspicious, gave chase, and I thought it best to vanish. I
hope no one was made to suffer for what may have been my imprudence."

"No, the lad whom Mr. Track caught was let go. But how did you happen
to come to Shopton?"

"To see you. I got your address from the owner of the yacht Resolute. I
knew that if there was one person who could aid me to recover my
rights, it would be you, Tom Swift. Will you help me?  Will you come
with me to discover the secret of Phantom Mountain?  If we go, it will
have to be in an airship, for in no other way, I think, can we come
upon the place, as it is closely guarded.  Will you come? I will pay
you well."

"Perhaps I had better hear your story," said the young inventor. "But
first let me suggest that we move farther away from the house. My
father, or Mr. Jackson, or the housekeeper, may hear us talking, and it
may disturb them. Come with me to my private shop," and Tom led the way
to a small building where he did experimental work. He unlocked the
door with a key he carried, turned on the lights, which were run by a
storage battery, and motioned Mr. Jenks to a seat.

"Now I'll hear your story," said Tom.

"I'll make it as short as possible," went on the queer man. "To begin
with, it is now several years ago since a poorly dressed stranger
applied to me one night for money enough to get a meal and a bed to
sleep in. I was living in New York City at the time, and this was
midnight, as I was returning home from my club.

"I was touched by the man's appearance, and gave him some money. He
asked for my card, saying he would repay me some day. I gave it to him,
little thinking I would hear from the man again.  But I did. He called
at my apartments about a week later, saying he had secured work as an
expert setter of diamonds, and wanted to repay me. I did not want to
take his money, but the fact that such a sorry looking specimen of
manhood as he had been when I aided him, was an expert handler of gems
interested me. I talked with the man, and he made a curious statement.

"This man, who gave his name as Enos Folwell, said he knew a place
where diamonds could be made, partly in a scientific manner, and partly
by the forces of nature. I laughed at him, but he told me so many
details that I began to believe him. He said he and some other friends
of his, who were diamond cutters, had a plant in the midst of the Rocky
Mountains, where they had succeeded in making several small, but very
perfect diamonds. They had come to the end of their rope, though, so to
speak, because they could not afford to buy the materials needed.
Folwell said that he and his companions had temporarily separated, had
left the mountain where they made diamonds, and agreed to meet there
later when they had more money with which to purchase materials. They
had all agreed to go out into civilization, and work for enough funds
to enable them to go on with their diamond making.

"I hardly knew whether to believe the man or not, but he offered proof.
He had several small, but very perfect diamonds with him, and he gave
them to me, to have tested in any way I desired.

"I promised to look into the matter, and, as I was quite wealthy, as,
in fact I am now, and if I found that the stones he gave me were real,
I said I might invest some money in the plant."

"Were the diamonds good?" asked Tom, who was beginning to be interested.

"They were--stones of the first water, though small. An expert gem
merchant, to whom I took them, said he had never seen any diamonds like
them, and he wanted to know where I got them. Of course I did not tell

"To make a long story short, I saw Folwell again, told him to
communicate with his companions, and to tell them that I would agree to
supply the cash needed, if I could share in the diamond making. To this
they agreed, and, after some weeks spent in preparation, a party of us
set out for Phantom Mountain."

"Phantom Mountain?" interrupted Tom. "Where is it?"

"I don't know, exactly--it's somewhere in the Rockies, but the exact
location is a mystery. That is why I need your help. You will soon
understand the reason. Well, as I said, myself, Folwell and the others,
who were not exactly prepossessing sort of men, started west. When we
got to a small town, called Indian Ridge, near Leadville, Colorado, the
men insisted that I must now proceed in secret, and consent to be
blindfolded, as they were not yet ready to reveal the secret of the
place where they made the diamonds.

"I did not want to agree to this, but they insisted, and I gave in,
foolishly perhaps. At any rate I was blindfolded one night, placed in a
wagon, and we drove off into the mountains. After traveling for some
distance I was led, still blindfolded, up a steep trail.

"When the bandage was taken off my eyes I saw that I was in a large
cave. The men were with me, and they apologized for the necessity that
caused them to blindfold me. They said they were ready to proceed with
the making of diamonds, but I must promise not to seek to discover the
secret until they gave me permission, nor was I to attempt to leave the
cave. I had to agree.

"Next they demanded that I give them a large sum, which I had promised
when they showed me, conclusively, that they could make diamonds. I
refused to do this until I had seen some of the precious stones, and
they agreed that this was fair, but said I would have to wait a few

"Well, I waited, and, all that while, I was virtually a prisoner in the
cave. All I could learn was that it was in the midst of a great range,
near the top, and that one of the peaks was called Phantom Mountain.
Why, I did not learn until later.

"At last one night, during a terrific thunder storm, the leader of the
diamond makers--Folwell--announced that I could now see the stones
made. The men had been preparing their chemicals for some days
previous. I was taken into a small chamber of the cave, and there saw
quite a complicated apparatus. Part of it was a great steel box, with a
lever on it.

"We will let you make some diamonds for yourself," Folwell said to me,
and he directed me to pull the lever of the box, at a certain signal.
The signal came, just as a terrific crash of thunder shook the very
mountain inside of which we were. The box of steel got red-hot, and
when it cooled off it was opened, and was given a handful of white

"Were they diamonds?" asked Tom, eagerly.

Mr. Jenks held out one hand. In the palm glittered a large
stone--ostensibly a diamond. In the rays of the moon it showed all the
colors of the rainbow--a beautiful gem. "That is one of the stones I
made--or rather that I supposed I had made," went on Mr. Jenks. "It is
one of several I have, but they have not all been cut and polished as
has this one.

"Naturally I was much impressed by what I saw, and, after I had made
certain tests which convinced me that the stones in the steel box were
diamonds, I paid over the money as I had promised.  That was my


"As soon as the men got the cash, they had no further use for me. The
next I remember is eating a rude meal, while we discussed the future of
making diamonds. I knew nothing more until I found myself back in the
small hotel at Indian Ridge, whence I had gone some time previous, with
the men, to the cave in the mountain."

"What happened?" asked Tom, much surprised by the unexpected outcome of
the affair. "I had been tricked, that was all! As soon as the men had
my money they had no further use for me. They did not want me to learn
the secret of their diamond making, and they drugged me, carried me
away from the cave, and left me in the hotel."

"Didn't you try to find the cave again?"

"I did, but without avail. I spent some time in the Rockies, but no one
could tell where Phantom Mountain was; in fact, few had heard of it,
and I was nearly lost searching for it.

"I came back East, determined to get even. I had given the men a very
large sum of money, and, in exchange, they had given me several
diamonds. Probably the stones are worth nearly as much as the money I
invested, but I was cheated, for I was promised an equal share in the
profits. These were denied me, and I was tricked. I determined to be
revenged, or at least to discover the secret of making diamonds. It is
my right."

"I agree with you," spoke Tom.

"But, up to the time I met you on Earthquake Island, I could form no
plan for discovering Phantom Mountain, and learning the secret of the
diamond makers," went on Mr. Jenks. "I carried the gems about with me,
as you doubtless saw when we were on the island. But I knew I needed an
airship in which to fly over the mountains, and pick out the location
of the cave where the diamonds are made."

"But how can you locate it, if you were blindfolded when you were taken
there, Mr. Jenks?"

"I forgot to tell you that, on our journey into the mountains, and just
before I was carried into the cave, I managed to raise one corner of
the bandage. I caught a glimpse of a very peculiarly shaped cliff--it
is like a great head, standing out in bold relief against the
moonlight, when I saw it. That head of rock is near the cave. It may be
the landmark by which we can locate Phantom Mountain."

"Perhaps," admitted the young inventor.

"What I want to know is this," went on Mr. Jenks. "Will you go with me
on this quest--go in your airship to discover the secret of the diamond
makers? If you will, I will share with you whatever diamonds we can
discover, or make; besides paying all expenses. Will you go, Tom Swift?"

The young inventor did not know what to answer. How far was Mr. Jenks
to be trusted? Were the stones he had real diamonds? Was his story,
fantastical as it sounded--true? Would it be safe for Tom to go?

The lad asked himself these questions. Mr. Jenks saw his hesitation.

"Here," said the strange man, "I will prove what I say. Take this
diamond. I intended it for you, anyhow, for what you did for me on
Earthquake Island. Take it, and--and give it to the person for whom you
were about to purchase a diamond to-night. But, first of all, take it
to a gem expert, and get his opinion. That will prove the truth of what
I say, Tom Swift, and I feel sure that you will cast your lot in with
mine, and help me to discover the secret of Phantom Mountain, and aid
me to get my rights from the diamond makers!"



Tom Swift considered a few minutes. On the face of it, the proposition
appealed to him. He had been home some time now after his adventures on
Earthquake Island, and he was beginning to long for more excitement.
The search for the mysterious mountain, and the cave of the diamond
makers, might offer a new field for him.  But there came to him a
certain distrust of Mr. Jenks.

"I don't like to doubt your word," began Tom, slowly, "but you know,
Mr. Jenks, that some of the greatest chemists have tried in vain to
make diamonds; or, at best, they have made only tiny ones. To think
that any man, or set of men, made real diamonds as large as the ones
you have, doesn't seem--well--" and Tom hesitated.

"You mean you can hardly believe me?" asked Mr. Jenks.

"I guess that's it," assented Tom.

"I don't blame you a bit!" exclaimed the odd man. "In fact, I didn't
believe it when they told me they could make diamonds. But they proved
it to me. I'm ready now to prove it to you."

"I'll tell you what I'll do. Here's this one stone, cut ready for
setting. Here's another, uncut," and Mr. Jenks drew from his pocket
what looked like a piece of crystal. "Take them to any jeweler," he
resumed--"to the one in whose place I saw you to-night.  I'll abide by
the verdict you get, and I'll come here to-morrow night, and hear what
you have to say."

"Why do you come at night?" asked Tom, thinking there was something
suspicious in that.

"Because my life might be in danger if I was seen talking to you, and
showing you diamonds in the daytime--especially just now.

"Why at this particular time?"

"For the reason that the diamond makers are on my trail. As long as I
remained quiet, after their shabby treatment of me, and did not try to
discover their secret, they were all right. But, after I realized that
I had been cheated out of my rights, and when I began to make an
investigation, with a view to discovering their secret whereabouts, I
received mysterious and anonymous warnings to stop."

"But I did not. I came East, and tried to get help to discover the cave
of the diamond makers, but I was unsuccessful. I needed an airship, as
I--said, and no person who could operate one, would agree to go with me
on the quest. Again I received a warning to drop all search for the
diamond makers, but I persisted, and about a week ago I found I was
being shadowed."

"Shadowed; by whom?" asked Tom.

"By a man I never remember seeing, but who, I have no doubt, is one of
the diamond-making gang."

"Do you think he means you harm?"

"I'm sure of it. That is the reason I have to act so in secret, and
come to see you at night. I don't want those scoundrels to find out
what I am about to do. On my return from Earthquake Island, I again
endeavored to interest an airship man in my plan, but he evidently
thought me insane. Then I thought of you, as I had done before, but I
was afraid you, too, would laugh at my proposition. However, I decided
to come here, and I did. It seemed almost providential that my first
view of you was in a jewelry shop, looking at diamonds. I took it as a
good omen. Now it remains with you. May I call here to-morrow night,
and get your answer?"

Tom Swift made up his mind quickly. After all it would be easy enough
to find out if the diamonds were real. If they were, he could then
decide whether or not to go with Mr. Jenks on the mysterious quest. So
he answered:

"I'll consider the matter, Mr. Jenks. I'll meet you here to-morrow
night. In the meanwhile, for my own satisfaction, I'll let an expert
look at these stones."

"Get the greatest diamond expert in the world, and he'll pronounce them
perfect!" predicted the odd man. "Now I'll bid you goodnight, and be
going. I'll be here at this time to-morrow."

As Mr. Jenks turned aside there was a movement among the trees in the
orchard, and a shadowy figure was seen hurrying away.

"Who's that?" asked the diamond man, in a hoarse whisper. "Did you see
that, Tom Swift? Some one was here--listening to what I said! Perhaps
it was the man who has been shadowing me!"

"I think not. I guess it was Eradicate Sampson, a colored man who does
work for us," said Tom. "Is that you, Rad?" he called.

"Yais, sah, Massa Tom, heah I is!" answered the voice of the negro, but
it came from an entirely different direction than that in which the
shadowy figure had been seen.

"Where are you, Rad?" called the young inventor.

"Right heah," was the reply, and the colored man came from the
direction of the stable. "I were jest out seein' if mah mule Boomerang
were all right. Sometimes he's restless, an' don't sleep laik he

"Then that wasn't you over in the orchard?" asked Tom, in some

"No, sah, I ain't been in de orchard. I were sleepin' in mah shack,
till jest a few minutes ago, when I got up, an' went in t' see
Boomerang. I had a dream dat some coon were tryin t' steal him, an' it
sort ob 'sturbed me, laik."

"If it wasn't your man, it was some one else," said Mr. Jenks,

"We'll have a look!" exclaimed Tom. "Here, Rad, come over and scurry
among those trees. We just saw some one sneaking around."

"I'll sure do dat!" cried the colored man. "Mebby it were somebody
arter Boomerang! I'll find 'em."

"I don't believe it was any one after the mule," murmured Mr. Jenks,
"but it certainly was some one--more likely some one after me."

The three made a hasty search among the trees, but the intruder had
vanished, leaving no trace. They went out into the road, which the moon
threw into bold relief along its white stretch, but there was no figure
scurrying away.

"Whoever it was, is gone," spoke Tom. "You can go back to bed, Rad,"
for the colored man, of late, had been sleeping in a shack on the Swift

"And I guess it's time for me to go, too," added Mr. Jenks.  "I'll be
here to-morrow night, Tom, and I hope your answer will be favorable."

Tom did not sleep well the remainder of the night, for his fitful
slumbers were disturbed by dreams of enormous caves, filled with
diamonds, with dark, shadowy figures trying to put him into a red-hot
steel box. Once he awakened with a start, and put his hand under his
pillow to feel if the two stones Mr. Jenks had given him, were still
there. They had not been disturbed.

Tom made up his mind to find out if the stones were really diamonds,
before saying anything to his father about the chance of going to seek
Phantom Mountain. And the young inventor wished to get the opinion of
some other jeweler than Mr. Track--at least, at first.

"Though if this one proves to be a good gem, I'll have Mr. Track set it
in a brooch, and give it to Mary for her birthday," decided the young
inventor. "Guess I'll take a run over to Chester in the Butterfly, and
see what one of the jewelers there has to say."

In addition to his big airship, Red Cloud, Tom owned a small, swift
monoplane, which he called Butterfly. This had been damaged by Andy
Foger just before Tom left on the trip that ended at Earthquake Island,
but the monoplane had been repaired, and Andy had left town, not having
returned since.

Telling his father that he was going off on a little business trip,
which he often did in his aeroplane, Tom, with the aid of Mr. Jackson,
the engineer, wheeled the Butterfly out of its shed.

Adjusting the mechanism, and seeing that it was in good shape, Tom took
his place in one of the two seats, for the monoplane would carry two.
Mr. Jackson then spun the propellers, and, with a crackle and roar the
motor started. Over the ground ran the dainty, little aeroplane, until,
having momentum enough, Tom tilted the wing planes and the machine
sailed up into the air.

Rising about a thousand feet, and circling about several times to test
the wind currents, Tom headed his craft toward Chester, a city about
fifty miles from Shopton. In his pocket, snugly tucked away, were the
two stones Mr. Jenks had given him.

It was not long before Tom saw, looming up in the distance the church
spires and towering factory chimneys of Chester, for his machine was a
speedy one, and could make ninety miles an hour when driven. But now a
slower speed satisfied our hero.

"I'll just drop down outside of the city," he reasoned, "for too much
of a crowd gathers when I land in the street. Besides I might frighten
horses, and then, too, it's hard to get a good start from the street.
I'll leave it in some barn until I want to go back."

Tom sent his craft down, in order to pick out a safe place for a
landing. He was then over the suburbs of the city, and was following
the line of a straight country road.

"Looks like a good place there," he murmured. "I'll shut off the motor,
and vol-plane down."

Suiting the action to the word, Tom shut off his power. The little
craft dipped toward the ground, but the lad threw up the forward
planes, and caught a current of air that sent him skimming along

As he got nearer to the ground, he saw the figure of a lad riding a
bicycle along the country highway. Something about the figure struck
Tom as being familiar, and he recognized the cyclist a moment later.

"It's Andy Foger!" said Tom, in a whisper. "I wondered where he had
been keeping himself since he damaged the Butterfly.  Evidently he
doesn't dare venture back to Shopton. Well, here's where I give him a

Tom's monoplane was making no more noise, now, than a soaring bird. He
was gliding swiftly toward the earth, and, with the plan in his mind of
administering some sort of punishment to the bully, he aimed the
machine directly at him.

Nearer and nearer shot the monoplane, as quietly as a sheet of paper
might fall. Andy pedaled on, never looking up nor behind him, A moment
later, as Tom threw up his headplanes, to make his landing more easy,
and just as he swooped down at one side of the cyclist, our hero let
out a most alarming yell, right into Andy's ear.

"Now I've got you!" he shouted. "I'll teach you to slash my aeroplane!
Come with me!"

Andy gave one look at the white bird-like apparatus that had flown up
beside him so noiselessly, and, being too frightened to recognize Tom's
voice, must have thought that he had been overtaken by some
supernatural visitor.

Andy gave a yell like an Indian, about to do a stage scalping act, and
fairly dived over the handlebars of his bicycle, sprawling in a heap on
the dusty road.

"I guess that will hold you for a while," observed Tom, grimly, as he
put on the ground-brake and brought his monoplane to a stop not far
from the fallen rider.



For several minutes Andy Foger did not arise. He remained prostrate in
the dust, and Tom, observing him, thought perhaps the bully might have
been seriously injured. But, a little later, Andy cautiously raised his
head, and inquired in a frightened voice:

"Is it--is it gone?"

"Is what gone?" asked Tom, grimly.

At the sound of his voice, Andy looked up. "Was that you, Tom Swift?"
he demanded. "Did you knock me off my wheel?"

"My monoplane and I together did," was the reply; "or, rather, we
didn't. It was the nervous reaction caused by your fright, and the
knowledge that you had done wrong, that made you jump over the
handlebars. That's the scientific explanation."

"You--you did it!" stammered Andy, getting to his feet. He wasn't hurt
much, Tom thought.

"Have it your own way," resumed our hero. "Did you think it was a
hob-goblin in a chariot of fire after you, Andy?"

"Huh! Never mind what I thought! I'll have you arrested for this!"

"Will you? Delighted, as the boys say. Hop in my airship and I'll take
you right into town. And when I get you there I'll make a charge of
malicious mischief against you, for breaking the propeller of the
Butterfly and slashing her wings. I've mended her up, however, so she
goes better than ever, and I can take you to the police station in jig
time. Want to come, Andy?"

This was too much for the bully. He knew that Tom would have a clear
case against him, and he did not dare answer. Instead he shuffled over
to where his wheel lay, picked it up, and rode slowly off.

"Good riddance," murmured Tom. He looked about, and saw that he was
near a house, in the rear of which was a good-sized barn.  "Guess I'll
ask if I can leave the Butterfly there," he murmured, and, ringing the
doorbell, he was greeted by a man.

"I'll pay you if you'll let me store my machine in the barn a little
while, until I go into the city, and return," spoke the lad.

"Indeed, you're welcome to leave it there without pay," was the answer.
"I'm interested in airships, and, I'll consider it a favor if you'll
let me look yours over while it's here."

Tom readily agreed, and a few minutes later he had caught a trolley
going into the city. He was soon in one of the largest jewelry stores
of Chester.

"I'd like to get an expert opinion as to whether or not those stones
are diamonds," spoke Tom, to the polite clerk who came up to wait on
him, and our hero handed over the two gems which Mr. Jenks had given
him. "I'm willing to pay for the appraisement, of course," the young
inventor added, as he saw the clerk looking rather doubtfully at him,
for Tom had on a rough suit, which he always donned when he flew in his

"I'll turn them over to our Mr. Porter, a gem expert," said the clerk.
"Please be seated."

The young man disappeared into a private office with the stones, and
Tom waited. He wondered if he was going to have his trouble for his
pains. Presently two elderly gentlemen came from the little room, on
the glass door of which appeared the word "Diamonds."

"Who brought these stones in?" asked one of the men, evidently the
proprietor, from the deference paid him by the clerk. The latter
motioned to Tom.

"Will you kindly step inside here?" requested the elderly man.  When
the door was closed, Tom found himself in a room which was mostly taken
up with a bench for the display of precious stones, a few chairs, and
some lights arranged peculiarly; while various scales and instruments
stood on a table.

"You wished an opinion on--on these?" queried the proprietor of the
place. Tom noticed at once that the word "diamonds" was not used.

"I wanted to find out if they were of any value," he said. "Are they

"Would you mind stating where you got them?" asked the other of the two

"Is that necessary?" inquired the lad. "I came by them in a legitimate
manner, if that's what you mean, and I can satisfy you on that point. I
am willing to pay for any information you may give me as to their

"Oh, it isn't that," the proprietor hastened to assure him.  "But these
are diamonds of such a peculiar kind, so perfect and without a flaw,
that I wondered from what part of the world they came."

"Then they are diamonds?" asked Tom, eagerly.

"The finest I have ever tested!" declared the other man, evidently Mr.
Porter, the gem expert. "They are a joy to look at, Mr. Roberts," he
went on, turning to the proprietor. "If it is possible to get a supply
of them you would be justified in asking half as much again as we
charge for African or Indian diamonds.  The Kimberly products are not
to be compared to these," and he looked at the two stones in his
hand--the one cut, and sparkling brilliantly, the other in a rough

"Do you care to state where these diamonds came from?" asked Mr.
Roberts, looking critically at Tom.

"I had rather not," answered the lad. "It is enough for me to know that
they are diamonds. How much is your charge?"

"Nothing," was the unexpected answer. "We are very glad to have had the
opportunity of seeing such stones. Is there any chance of getting any

"Perhaps," answered Tom, as he accepted the gems which the expert held
out to him.

"Then might we speak for a supply?" went on Mr. Roberts, eagerly. "We
will pay you the full market price."

"What is the value of these stones?" asked Tom.

Mr. Roberts looked at his gem expert.

"It is difficult to say," was the answer of the man who had handed Tom
the gems. "They are so far superior to the usual run of diamonds, that
I feel justified in saying that the cut one would bring fifteen hundred
dollars, anywhere. In fact, I would offer that for it. The other is
larger, though what it would lose in cutting would be hard to say. I
should say it was worth two thousand dollars as it is now."

"Thirty-five hundred dollars for these two stones!" exclaimed Tom.

"They are worth every cent of it," declared Mr. Roberts. "Do you want
to sell?"

Tom shook his head. He could scarcely believe the good news.  Mr. Jenks
had told the truth. Now the young inventor could go with him to seek
the diamond makers.

"Can you get any more of these?" went on Mr. Roberts.

"I think so--that is I don't know--I am going to try," answered the lad.

"Then if you succeed I wish you would sell us some," fairly begged the
proprietor of the store.

"I will," promised Tom, but he little knew what lay before him, or
perhaps he would not have made that promise. He thanked the diamond
merchant for his kindness, and arranged to have the cut stone set in a
pin for Miss Nestor. The uncut gem Tom took away with him.

Thinking of many things, and wondering how best to start in his airship
Red Cloud for the mysterious Phantom Mountain, Tom hurried back to
where he had left the monoplane, wheeled it out, and was soon soaring
through the air toward Shopton.

"I think I'll go with Mr. Jenks," he decided, as he prepared for a
landing in the open space near his aeroplane shed. "It will be a risky
trip, perhaps, but I've taken risks before. When Mr. Jenks comes
to-night I'll tell him I'll help him to get his rights, and discover
the secret of the diamond makers."

As Tom was wheeling the Butterfly into the shed, Eradicate came out to
help him.

"Dere's a gen'man here to see yo', Massa Tom," said the colored man.

"Who is it?"

"I dunno. He keep askin' ef yo' de lad what done bust up Earthquake
Island, an' send lightnin' flashes up to de sky, an' all sech questions
laik dat."

"It isn't Mr. Damon; is it, Rad? He hasn't been around in some time."

"No, Massa Tom, it ain't him. I knows dat blessin' man good an' proper.
I jest wish he'd bless mah mule Boomerang some day, an' take some oh de
temper out ob him. No, sah, it ain't Massa Damon.  De gen'man's in de
airship shed waitin' fo' you."

"In the airship shed! No strangers are allowed in there, Rad."

"I knows it, Massa Tom, but he done persisted his se'f inter it, an' he
wouldn't come out when I told him; an' your pa an' Mr. Jackson ain't

"I'll see about this," exclaimed Tom, striding to the large shed, where
the Red Cloud was kept. As he entered it he saw a man looking over the
wonderful craft.

"Did you want to see me?" asked Tom, sharply, for he did not like
strangers prowling around.

"I did, and I apologize for entering here, but I am interested in
airships, and I thought you might want to hire a pilot. I am in need of
employment, and I have had considerable to do with balloons and
aeroplanes, but never with an airship like this, which combines the two
features. Do you wish to hire any one."

"No, I don't!" replied Tom, sharply, for he did not like the looks of
the man.

"I was told that you did," was the rather surprising answer.

"Who told you?"

The man looked all around the shed, before replying, as if fearful of
being overheard. Then, stepping close to Tom, he whispered:

"Mr. Jenks told me!"

"Mr. Jenks?" Tom could not conceal his astonishment.

"Yes. Mr. Barcoe Jenks. But I did not come here to merely ask you for
employment. I would like to hire out to you, but the real object of my
visit was to say this to you."

The man approached still closer to Tom, and, in a lower voice, and one
that could scarcely be heard, he fairly hissed:

"Don't go with Barcoe Jenks to seek the diamond makers!"

Then, before Tom could put out a hand to detain him, had the lad so
wished, the man turned suddenly, and fairly ran from the shed.



The young inventor stood almost spellbound for a few moments.  Then
recovering himself he made a dash for the door through which the
mysterious man had disappeared. Tom saw him sprinting down the road,
and was half-minded to take after him, but a cooler thought warned him
that he had better not.

"He may be one of those men who are on Mr. Jenks' trail," reasoned Tom,
in which case it might not be altogether safe to attempt to stop him,
and make him explain. Or he may be a lunatic, and in that case it
wouldn't be altogether healthy to interfere with him.

"I'll just let him go, and tell Mr. Jenks about him when he comes
to-night. But I must warn Rad never to let him in here again. He might
damage the airship."

Calling to the colored man, Tom pointed to the stranger, who was almost
out of sight down the road, and said earnestly:

"Rad, do you see that fellow?"

"I sho do, Massa Tom, but I sorter has t' strain my eyes t' do it. He's
goin' laik my mule Boomerang does when he's comm' home t' dinnah."

"That's right, Rad. Well, never let that man set foot inside our fence
again! If he comes, and I'm home, call me. If I'm away, call dad or Mr.
Jackson, and if you're here alone, drive him away, somehow."

"I will, Massa Tom!" exclaimed the colored man, earnestly, "an' if I
can't do it alone, I'll get Boomerang t' help. Once let dat ar' mule
git his heels on a pusson, an' dat pusson ain't goin' t' come bodderin'
around any mo'--that is, not right away."

"I believe you, Rad. Well, keep a lookout for him, and don't let him
in," and with that Tom entered the house to think over matters. They
were beginning to assume an aspect he did not altogether like. Not that
Tom was afraid of danger, but he preferred to meet it in the open, and
the warning, or threat, of the mysterious man disquieted him.

When Mr. Swift came home, a little later, his son told him of the
midnight interview with Mr. Jenks, for, up to this time, the aged
inventor was unaware of it, and Tom also gave an account of the
diamonds, speaking of their value.

"And do you propose to go to Phantom Mountain, in search of the makers
of these gems, Tom?" asked Mr. Swift.

"I had about decided to do so, dad."

"And you're going in the Red Cloud?'


"Who are going with you?"

"Well, Mr. Jenks will go, of course, and I've no doubt but that if I
mention the prospective trip to Mr. Damon, that he'll bless his skating
cap, or something like that, and come along."

"I suppose so, Tom, and I'd like to have you take him. But I think
you'll need some one else."

"Because, from what you have told me, you are going out to a dangerous
part of the country, and you may have to deal with unscrupulous men.
Three of you are hardly enough to cope with them. You ought to have at
least another member of your party. If I was not busy on my invention
of a new wireless motor I would go along, but I can't leave. You might
take Mr. Jackson."

"No, you need him here to help you, dad."

"How about Eradicate?"

Tom smiled.

"Rad would get homesick for his mule Boomerang, and I'd have to bring
him back just when we'd found the diamonds," replied the young
inventor. "No, we'll have to think of some one else. I'll ask Mr.
Damon, and then I'll consider matters further. I expect to see Mr.
Jenks to-night, and he may have some one in mind."

"Perhaps that will be a good plan. Well, Tom, I trust you will take
good care of yourself, and not run into unnecessary danger.  Is the Red
Cloud in good shape for the voyage?"

"It needs looking over. I'm going to get right at it."

"It's a pretty indefinite sort of a quest you're going on, Tom, my son.
How do you expect to find Phantom Mountain?"

"Well, it's going to be quite a task. In the first place we'll head for
Leadville, Colorado, and then we'll go to Indian Ridge and make some
inquiries. We may get on the track of the place that way. If we don't,
why I'll take the airship up as high as is necessary and sort of
prospect until we see that big cliff that's shaped like a head. That
will give us something to go by."

"Well, do the best you can. If you can discover the secret of making
diamonds it will be a valuable one."

"I guess it will, dad; and Mr. Jenks is entitled to know it, for he
paid his good money to that end. He has promised to go halves with me,
as payment for the use of the airship, and I must say the two diamonds
he gave me last night have proved very valuable."

"Two diamonds, Tom? You only showed me one, an uncut gem"; and Mr.
Swift looked at his son.

"Oh, the other--er--the other is--I left it with a jeweler," and Tom
blushed a trifle, as he thought of the present he contemplated making
to Mary Nestor.

That afternoon, as Tom was out in the shed of the Red Cloud looking
over the airship, to see what would be necessary to do to it in order
to get it in shape for a long trip, he heard voices outside.

"Yes--yes, I know the way in perfectly well," he caught. "You needn't
bother to come, my good fellow. Just step this way, and I'll show you
something worth seeing."

"I wonder if it's that mysterious man coming back?" thought Tom. He
dropped the tool he was using, and hurried to the door.  As he
approached it he heard the voice continue.

"Why bless my shoe laces, Mr. Parker! You'll see a wonderful airship, I
promise you. Wonderful! Bless my hatband, but I hope Tom is here!"

"Mr. Damon!" exclaimed our hero, as he recognized the tones of his
eccentric friend. "But who is with him?"

A moment later he caught sight of the gentleman who was always blessing
himself, or something. Behind him stood another man, whose features Tom
could not see plainly.

"Hello, Tom Swift!" called Mr. Damon. "Looking over the Red Cloud, eh?
Does that mean you're off on another trip?"

"I guess it does," answered the lad.

"Where to this time? if I may ask."

"I'm thinking of going off to the mountains to find a band of men
engaged in making diamonds," replied Tom.

"Making diamonds! Bless my finger ring! Making diamonds! A trip to the
mountains! Bless my disposition! but do you know I'd like to go with

"I was thinking of asking you, Mr. Damon."

"Were you? Bless my heart, I'm glad you thought of me. You don't by any
possible chance want another person; do you?"

"We were thinking of having four in the party, Mr. Damon," and Tom
wondered who was with his eccentric friend.

"Then bless my election ticket! This is the very chance for you, Mr.
Parker!" cried Mr. Damon. "Will you go with us? It will be just what
you need," and Mr. Damon stepped aside, revealing to Tom the features
of Mr. Ralph Parker, the scientist who had correctly predicted the
destruction of Earthquake Island.



Tom Swift was a most generous lad, but when he saw that Mr. Damon had
with him Mr. Parker, the gloomy scientist, who seemed to take delight
in predicting disasters, our hero's spirits were not exactly of the
best. He would have much preferred not to take Mr. Parker on the quest
for the diamond makers, but, since Mr. Damon had mentioned it, he did
not see how he could very well refuse.

"But perhaps he won't care to go," thought Tom.

He was undeceived a moment later, however, for the scientist remarked:

I am very glad to meet you once more, Mr. Swift. I have scarcely
thanked you enough for what you did for us in erecting your wireless
station on Earthquake Island, which, as you recall, I predicted would
sink into the sea. It did, I am glad to say, not because I like to see
islands destroyed, but because science has been vindicated. Now I have
just heard you remark that you are about to set off to the mountains in
search of some men who are making diamonds. I need hardly state that
this is utterly useless, for no diamonds, commercially valuable, can be
made by men. But the trip may be valuable in that it will permit me to
demonstrate some scientific facts.

"Therefore, if you will permit me, I will be very glad to accompany you
and Mr. Damon. I shall be delighted, in short, and I can start as soon
as you are ready."

"There's no hope for it!" thought Tom, dismally. "I suppose he'll wake
up every morning, and predict that before night the world will come to
an end, or he'll prophesy that the airship will blow up, and vanish,
when about seven miles above the clouds. Well, there's no way out of
it, so here goes."

Thereupon Tom welcomed the scientist as cordially as he could, and
invited him to form one of the party that would set off in the airship
to search for Phantom Mountain.

"Bless my jewelry box!" exclaimed Mr. Damon, when this formality was
over. "Tell me more about it, Tom."

Which our hero did, stating the need of maintaining secrecy on account
of the danger to Mr. Jenks. Mr. Damon and Mr. Parker both agreed to say
nothing about the matter, and then the scientist became much interested
in the Red Cloud, which he closely examined. He even complimented Tom
on the skill shown in making it, and, contrary to our hero's
expectation, did not predict that it would blow up the next time it was

"How did you happen to arrive just at this time, Mr. Damon?" asked Tom.

"It was partly due to Mr. Parker," was the answer. "I had not seen him
since we were rescued from the island, until a few days ago he called
on me at my home. I happened to mention that you lived near here, and
suggested that he might like to see some of your inventions. He agreed,
and we came over in my auto. And now, bless my liver-pin! I find you
about to start off on another trip."

"And have you fully decided to go with me?" asked Tom. "There may be
danger, and I don't like the way that mysterious man behaved."

"Oh, bless my revolver!" cried Mr. Damon. "I'm used to danger by this
time. Of course I'm going, and so is Mr. Parker. Do you know," and the
man, who was always blessing something, came closer to the lad, and
whispered: "Do you know, Tom, Mr. Parker is a very peculiar individual."

"I'm sure of it," answered the young inventor, looking at the gentleman
in question, who was then inside the airship cabin.

"But he's all right, even if he is predicting unpleasant things," went
on Mr. Damon. "I think we'll get better acquainted with him after a

"I hope so," agreed Tom, but he did not realize then how close his
companionship with Mr. Parker was to be, nor what dangers they were to
share later.

The friends talked at considerable length of the prospective trip, and
Tom, by this time, had ascertained what needed to be done to the
airship to get it in shape to travel. It would take about a week, and,
in the meanwhile, Mr. Damon would go home and get his affairs in order
for the voyage. Tom's father was introduced to Mr. Parker, and, the
former, finding that the scientist held some views in common with him,
invited the gloomy predictor to remain at the Swift home until the Red
Cloud was ready to sail. Tom could not repress a groan at this, but he
decided he would have to make the best of it.

Mr. Damon left for home that afternoon, promising to be on hand at the
time set to start for Phantom Mountain.

Tom was up waiting for Mr. Jenks at twelve o'clock that night.  Shortly
after the hour he saw a dark figure steal into the orchard. At first he
feared lest it might be one of the spies who were, he was now
convinced, on the trail of the man who was seeking to discover the
secret of the diamond makers. But a whistle, which came to the lad's
ear a moment later (that being a signal Mr. Jenks had agreed to sound),
told Tom that it was none other than the visitor he expected.

"All right, Mr. Jenks, I'm here," called Tom, cautiously. "Come over
this way," and he went out from the shadow of the house, where he had
been waiting, and met the men. "We'll go into my private work-shop,"
the youth added, leading the way.

"Have you decided to go with me?" asked Mr. Jenks, in an anxious
whisper. "Did you find the diamonds to be real ones?"

"I did; and I'm going," spoke Tom.

"Good! That relieves my mind. But we are still in danger. I was
followed by my shadower to-day, and only succeeded in shaking him off
just before coming here. I don't believe he knows what I am about to

"Oh, yes he does," said Tom.

"He does? How?"

"Because he was here, and warned me against you!"

"You don't mean it! Well, they are getting desperate! We must be on our
guard. What sort of a man was he?"

Tom described the fellow, and Mr. Jenks stated that this tallied with
the appearance of the person who had been shadowing him.

"But we'll fool them yet!" cried Tom, who had now fully entered into
the spirit of the affair. "If they can follow us in the Red Cloud
they're welcome to. I think we'll get ahead of them."

He then told of Mr. Damon and Mr. Parker, and Mr. Jenks agreed that it
would add to the strength of the party to take these two gentlemen

"Though I can't say I care so much for Mr. Parker," he added.  "But now
as to ways and means. When can we start?"

Thereupon he and Tom talked over details in the seclusion of the little
office, and arranged to leave Shopton in about a week.  In the
meanwhile the airship would be overhauled, stocked with supplies and
provisions, and be made ready for a swift dash to the mountains.

"And now I must be going," said Mr. Jenks. "I have a great deal to do
before I can start on this trip, and I hope I am not prevented by any
of those men who seem to be trailing me."

"How could they prevent you?" Tom wanted to know.

"Oh, there are any number of ways," was the answer. "But I'm glad you
found that my diamonds were real. We'll soon have plenty, if all goes

As Mr. Jenks left the shop, he started back, in some alarm.

"What's the matter?" asked Tom.

"Over there--I thought I saw a figure sneaking along under the
trees--that man--perhaps--"

"That's Eradicate, our colored helper," replied Tom, with a laugh. "I
posted him there to see that no strangers came into the orchard.
Everything all right, Rad?" he asked, raising his voice.

"Yais, sah, Massa Tom. Nobody been around yeah this night."

"That's good. You can go to bed now," and Eradicate, yawning loudly,
went to his shack. A little later Tom sought his own room, Mr. Jenks
having hurried off to town, where he was boarding.

The next few days saw Tom busily engaged on the airship, making some
changes and a few repairs that were needed. His father, Eradicate and
Mr. Jackson helped him. As for Mr. Parker, the scientist, he went about
the place, being much interested in the various machines which Tom or
Mr. Swift had patented.

At other times the scientist would stroll about the extensive grounds,
making what he said were "observations." One afternoon Tom saw him,
apparently much excited, kneeling down back of a shed, with his ear to
the ground.

"What is the matter?" asked the lad, thinking perhaps Mr. Parker might
be ill.

"Have you ever had any earthquakes here, Tom Swift?" asked the
scientist, quietly.

"Earthquakes? No. We had enough of them on the island."

"And you are going to have one here, in about two minutes!" cried Mr.
Parker. "I predict that this place will be shaken by a tremendous shock
very soon. We had all better get away from the vicinity of buildings."

"What makes you think there will be an earthquake?" asked Tom.

"Because I can hear the rumbling beneath the ground at this very
minute. It is increasing in volume, showing that the tremors are
working this way. There will soon be a great subterranean upheaval!
Listen for yourself."

Tom cast himself down on the grass. Placing his ear close to the ground
he did hear a series of dull thuds. He arose, not a little alarmed.
There had never been any earthquakes in Shopton, yet he had great
respect for Mr. Parker's scientific attainments.

Just then Eradicate Sampson came along. He saw Tom and Mr. Parker lying
flat on the ground, and surprise showed on his honest, black face.

"Fo' de land sakes!" cried Eradicate. "What am de mattah now, Massa

"Earthquake coming," answered Tom, briefly. "Better get away from the
buildings, Rad. They might fall!" Tom's face showed the alarm he felt.
What would happen to all of his valuable machines--to the Red Cloud?

"Earthquake?" murmured Eradicate, and he, too, cast himself down to
listen. A moment later he arose with a laugh.

"What's the matter?" cried Tom.

"Why, dat ain't no earthquake!" declared the colored man.

"No. Then perhaps you know what it is," said Mr. Parker, somewhat

"Course I knows what it am," answered Eradicate, with dignity.  "Dat
noise am my mule Boomerang, kickin' in his stable, on account oh me not
feedin' him yet. Dat's what it am. I'se gwine right now t' gib him his
oats, and den yo' see dat de noise stop.  Boomerang allers kick dat way
when he's hungry. I show yo'!"

And, sure enough, when Eradicate had gone to the mule's stable, which
was near where Mr. Parker had heard the mysterious sounds, they
immediately ceased.

"Dat mule was all de earthquake dere was around here," said the colored
man as he came out.

Mr. Parker walked away, saying nothing, and Tom did not make any
comments--just then.



It was a great relief to Tom, to find that there was no danger from an
earth tremor. Now that he had made up his mind to go in search of the
diamond makers, he wanted nothing to interfere with it. Lest the
feelings of Mr. Parker might be hurt by the mistake he had made, the
young inventor cautioned Eradicate not to say anything more about the

"'Deed an' I won't," the colored man promised. "I'se only too glad dere
wa'n't no earthquake, dat's what I is."

As for Mr. Parker, he did not appear much put out by his error in

"I am sure that what I heard was a tremor, due to some distant
earthquake shock," he said. "The mule's kicking was only a coincidence."

And Tom let him have his way about it. The week was drawing to a close,
and the Red Cloud was nearly in shape for the voyage. At almost the
last minute Tom found that he needed some electrical apparatus for the
airship, and as he had to go to Chester for it, he decided he would
make the trip in his monoplane, and, while in the city, would also get
the diamond pin he was having made for Mary Nestor.

He started off early one morning, in the swift little craft Butterfly,
and soon had reached Chester. The diamond brooch was ready for him.

"It is one of the most beautiful stones we have ever set," the diamond
merchant told him. "Don't forget, if you find any more, Mr. Swift, to
let us have a chance to bid on them."

"I may," Tom promised, rather indefinitely. Then, having purchased his
electrical supplies, he made a quick trip to Shopton, stopping on the
way to call on Miss Nestor.

"Why Tom, I'm delighted to see you!" cried the girl, blushing prettily.
"Did you come for some apple turnovers?" and she laughed, as she
referred to a call Tom had once paid, when a new cook had been engaged,
and when the pastry formed a feature of the meal.

"No turnovers this time," said the young inventor. "I came to wish you
many happy returns of the day."

"Oh, you remembered my birthday! How nice of you!"

"And here is something else," added our hero, rather awkwardly, as he
handed her the diamond pin.

"Oh, Tom! This for me! Oh, it's too lovely--it's far too much!"

"It isn't half enough!" he declared, warmly. "Oh, what a large
diamond!" Mary cried as she saw the sparkling stone. "I never saw one
so large and beautiful!"

"It's just as easy to make them large as small," explained Tom.

"Make them?" she looked the surprise she felt.

"Yes, I'm about to start for the place where diamonds are made."

"Oh, Tom! But isn't it dangerous? I mean won't you have to go to some
far country--like Africa--to get to where diamonds are made?"

"Well, we are going on quite a trip, but not as far as that.  And as
for the danger--well, we'll have to take what comes," and he told her
something of the proposed quest.

"Oh, it sounds--sounds scary!" Mary exclaimed, when she had heard of
Mr. Jenks' experience. "Do be careful, Tom!"

"I will," he promised, and, somehow he was glad that she had cautioned
him thus--and in such tones as she had used. For Mary Nestor was a girl
that any young chap would have been glad to have manifest an interest
in him.

"Well, I guess I'll have to say good-by," spoke Tom, at length.  "We
expect to start in a couple of days, and I may not get another chance
to see you."

"Oh, I--I hope you come back safely," faltered Mary, and then she held
out her hand, and Tom--well, it's none of our affair what Tom did after
that, except to say that he hurried out, fairly jumped into his
monoplane, and completed the trip home.

As the Red Cloud has been fully described in the volume entitled "Tom
Swift and His Airship," we will not go into details about it now.
Sufficient to say that it was a combination of a biplane and dirigible
balloon. It could be used either as one or the other, and the gas-bag
feature was of value when the wind was too great to allow the use of
the planes, or when the motive power, for some reason stopped. In that
event the airship could remain suspended far above the clouds if
necessary. There was provision for manufacturing the gas on board.

The Red Cloud was fitted up to accommodate about ten persons, though it
was seldom that this number was carried. Two persons could successfully
operate the machinery. There were sleeping berths, and in the main
cabin a sitting-room, a dining-room, and a kitchen. There was also the
motor compartment, and a steering tower, from which the engines could
be controlled.

It was in this craft that the seekers after the diamond makers proposed
undertaking the trip. Mr. Damon came on from his home in Waterfield
about two days before the date set to leave, and Mr. Jenks, had, three
days before this, taken up his abode at the Swift home. Mr. Parker, as
has been stated, was already there, and he had put in his time making a
number of scientific observations, though he had made no more

Nothing more had been seen of the mysterious man who had warned Tom,
and the young inventor and Mr. Jenks began to hope that they had thrown
their enemies off the track.

"Though I don't imagine they'll give up altogether," said Mr. Jenks.
"They're too desperate for that. We'll have trouble with them yet."

"Well, it can't be helped," decided Tom. "We'll try and be ready for
it, when it comes," and then, dismissing the matter from his mind, he
busied himself about the airship.

The food and supplies had all been put aboard, and they expected to
start the next morning. In order to make sure that any stones which
they might succeed in getting from the diamond makers were real gems, a
set of testing apparatus was taken along. Mr. Parker had had some
experience in this line, and, in spite of the fact that he might make
direful predictions, Tom was rather glad, after all, that the scientist
was going to accompany them.

"But what is worrying me," said Mr. Damon, "is what we are going to do
after we get to Phantom Mountain. What are your plans, Mr. Jenks? Will
you go in, and demand your share of the diamond-making business?"

"I have a right to it, as I invested a large sum in it, and I am
entitled to more than a half-share. But, of course, I can't say what
I'll do until I get there. We may have to act very secretly."

"I'm inclined to think we will," said Tom. "My plan would be to gain
access to the cave, if possible, and watch them at work. We might be
able to discover the secret of making diamonds, and, after all, that's
what you want, isn't it, Mr. Jenks?"

"Yes, I paid my money for the secret, and I ought to have it.  If I can
get it quietly, so much the better. If not, I'll fight for my rights!"
and he looked very determined.

"Bless my powder horn!" cried Mr. Damon. "That's the way to talk! And
so we're to go cruising about in the air, looking for a mountain shaped
like a man's head."

"That's it," a greed Mr. Jenks, "and when we find it we will be near
Phantom Mountain, and the diamond makers."

The final details were completed that night. The last of the supplies
had been put aboard, the larder was well stocked, the diamond testing
apparatus was stored safely away, and all that remained was for the
adventurers to board the Red Cloud in the morning, and soar away.

That night Tom was uneasy. Several times he got up, and looked toward
the shed where the airship was stored. He could not rid himself of the
idea that the men to whose interest it was that the diamond-making
secret remain undiscovered, might attempt to wreck the airship before
the start. Consequently both Eradicate Sampson and Engineer Jackson
were on guard. Tom looked from his window, to the shed where the Red
Cloud was housed. He saw nothing to cause him any uneasiness.

"I guess I'm just nervous," he mused. "But, all the same, I'll be glad
when we've started."

They were all up early the next morning, Mr. Damon beginning the day by
blessing the sunrise, and many other things that struck his fancy. The
airship was wheeled out of the shed, and Tom gave her a final

"It's all right," he declared. "All aboard!"

"Now, do be careful," begged Mr. Swift. "Don't take too many chances,

"I'll not."

The adventurers were in the forward part of the ship, and Tom had taken
his place at the wheels and levers in the pilot house.  As he was about
to start the motor he looked toward the road, and saw a horse and
carriage. In the vehicle was a girlish figure, at the sight of which
Tom blushed and smiled. He waved his hand.

"I came to wish you good luck!" cried Mary Nestor, for it was she in
the carriage.

"Thanks!" cried Tom, leaning from the window of the pilot house. "It
was good of you to get up so early."

"Oh. I'm always up early," she informed him.

"Look out that the motor doesn't scare your horse," Tom warned her.

"Old Dobbin doesn't mind anything," was her answer. "I'll see that he
doesn't run away with me, as long as you're not on earth to rescue me.
Good-by, Tom!"

"Good-by!" he called, and then he pulled the lever that set in motion
the motor, and whirled the great propellers about. They whizzed around
with a roar, and the Red Cloud, shivering and trembling with the
vibration, rose in the air like some great bird.

"We're off for the West and Phantom Mountain!" called Tom to his

As the airship soared upward, Eradicate Sampson ran forward from where
he had been standing near his mule Boomerang. He waved his hands, and
shouted something.

"Bless my hatband! What does he want?" asked Mr. Damon, watching him

"It sounds as if he were calling to us to come back," spoke Mr. Parker.

"It's too late now," decided Tom. "Maybe he forgot to tell us good-by,"
but, he felt a vague wonder at Eradicate's odd motions; for the colored
man was pointing toward the stern of the airship, as if there was
something wrong there. But the Red Cloud soared on.



Rapidly the airship ascended, and, when it was high over the town of
Shopton, Tom headed the craft due west. Looking down he tried to descry
Mary Nestor, in her carriage, but the trees were in the way, their
interlocking branches hiding the girl. Tom did see crowds of other
persons, though, thronging the streets of Shopton, for, though the
young inventor had made many flights, there was always a novelty about
them, that brought out the curious.

"A good start, Tom Swift," complimented Mr. Parker. "Is it always as
easy as this?"

"Starting always is," was the answer, "though, as the Irishman said,
coming down isn't sometimes quite so comfortable."

"Bless my gizzard! That's so," cried the eccentric Mr. Damon.  "Can we
vol-plane to earth in the Red Cloud, Tom?"

"Yes, but not as easily as in the Butterfly. However I hope we will not
have to. Now, Mr. Damon, if you will just take charge of the steering
apparatus for a minute, I want to go aft."

"What for?"

"I wish to see if everything is all right. I can't imagine why
Eradicate was making those queer motions."

Mr. Damon, who knew how to operate the Red Cloud, was soon guiding her
on the course, while Tom made his way to the rear compartments, through
the motor room, where the stores of supplies and food were kept. He
made a careful examination, looking from an after window, and even
going out on a small, open platform, but could discover nothing wrong.

"I guess Rad was just capering about without any special object," mused
Tom, but it was not long after this that they learned to their dismay,
that the colored man had had a method in his madness.

On his way back through the motor room Tom looked to the machinery, and
adjusted some of the auxiliary oil feeders. The various pieces of
apparatus were working well, though the engine had not yet been speeded
up to its limit. Tom wanted it to "warm-up" first.

"Everything all right?" asked Mr. Damon, as Tom rejoined them in the
pilot house, which was just forward of the living room in the main

"Yes, I can't imagine what made Rad act that way. But I'll set the
automatic steering gear now, Mr. Damon, and then you will be relieved."

Mr. Jenks was gazing off toward the west--to where he hoped to discover
the secret of Phantom Mountain.

"How do you like it?" asked Tom.

"It's great," replied the diamond man. "I've never been in an airship
before, and it's different than what I expected; but it's great! It's
the only craft that will serve our purpose among the towering mountain
peaks, where the diamond makers are hidden. I hope we can find them."

In a little while the Red Cloud was skimming along at faster speed,
guided by the automatic rudders, so that no one was needed in the pilot
house, since there was no danger of collisions.  Airships are not quite
numerous enough for that, yet, though they may soon become so.

Tom and the others devoted several hours to arranging their staterooms
and bunks, and getting their clothing stowed away, and when this was
done Mr. Parker and Mr. Jenks sat gazing off into space.

"It's hard to realize that we are really in an airship," observed the
diamond man. "At first I thought I would be frightened, but I'm not a
bit. It doesn't seem as if anything could happen."

"Something is likely to happen soon," said Mr. Parker, suddenly, as he
gazed at some weather instruments on the cabin wall.

"Bless my soul! Don't say that!" cried Mr. Damon. "What is it?"

"I think, from my observations, that we will soon have a hurricane,"
said the scientific man. "There is every indication of it"; and he
seemed quite delighted at the prospect of his prediction coming true.

"A hurricane!" cried Mr. Damon. "I hope it isn't like the one that blew
us to Earthquake Island."

"Oh, I think there will be no danger," spoke Tom. "If it comes on to
blow we will ascend or descend out of the path of the storm. This craft
is not like the ill-fated Whizzer. I can more easily handle the Red
Cloud; even in a bad storm."

"I'm glad to hear that," remarked Mr. Jenks. "It would be too bad to be
wrecked before we got to Phantom Mountain."

"Well, I predict that we will have a bad storm," insisted Mr. Parker,
and Tom could not help wishing that the scientist would keep his gloomy
forebodings to himself.

However the storm had not developed up to noon, when Tom, with Mr.
Damon's help, served a fine meal in the dining-room. In the afternoon
the speed of the ship was increased, and by night they had covered
several hundred miles. Through the darkness the Red Cloud kept on,
making good time. Tom got up, occasionally, to look to the machinery,
but it was all automatically controlled, and an alarm bell would sound
in his stateroom when anything went wrong.

"Bless my napkin!" exclaimed Mr. Damon the next morning, as they sat
down to a breakfast of fruit, ham and eggs and fragrant coffee, "this
is living as well as in a hotel, and yet we are--how far are we above
the earth, Tom?" he asked, turning to the young inventor.

"About two miles now. I just sent her up, as I thought I detected that
storm Mr. Parker spoke of."

"I told you it would come," declared the scientist, and there was a
small hurricane below them that morning, but only the lower edge of it
caught the Red Cloud, and when Tom sent her up still higher she found a
comparatively quiet zone, where she slid along at good speed.

That afternoon Tom busied himself about some wires and a number of
complicated pieces of apparatus which were in one corner of the main

"What are you doing now?" asked Mr. Jenks, who had been talking with
Mr. Parker, and showing that scientist some of the manufactured

"Getting our wireless apparatus in shape," answered the lad. "I should
have done it before, but I had so much to do that I couldn't get at it.
I'm going to send off some messages. Dad will want to know how we are

As he worked away, he also made up his mind to send another message, in
care of his father, for there was a receiving station in the Swift
home. And to whom this message was addressed Tom did not say, but we
fancy some of our readers can guess.

Finally, after several hours of work, the wireless was in shape to send
and receive messages. Tom pulled over the lever, and a crackling sound
was heard, as the electricity leaped from the transmitters into space.
Then he clamped the receiver on his ear.

"All ready," he announced. "Has anybody any messages they wish sent?"
For, with the courtesy of a true host he was ready to serve his guests
before he forwarded his own wireless notes.

"Just tell my wife that I'm enjoying myself," requested Mr. Damon.
"Bless my footstool! But this is great! We're off the earth yet,
connected with it."

Mr. Jenks had no one to whom he wanted to send any word, but Mr. Parker
wish to wire to a fellow scientist the result of some observations made
in the upper air.

Tom noted all the messages down, and then, when all was in readiness he
began to call his home station. He knew that either his father or Mr.
Jackson, the engineer, could receive the wireless.

But, no sooner had the young inventor sent off the first few dots and
dashes representing "S. I."--his home station call--than he started and
a look of surprise came over his face.

"They're calling us!" he exclaimed.

"Who is?" asked Mr. Jenks.

"My house--my father. He--he's been trying to get us ever since we
started, but I didn't have the wireless in shape to receive messages.
Oh, I hope it's not too late!"

"Too late! Bless my soul, too late for what?" gasped Mr. Damon,
somewhat alarmed by Tom's manner.

The lad did not answer at once. He was intently listening to a series
of dots and dashes that clicked in the telephone receiver clamped to
his left ear. On his face there was a look of worriment.

"Father has just sent me a message," he said. "It's a warning flashed
through space! He's been trying to get it to me since yesterday!"

"What is it?" asked Mr. Jenks, rising from his seat.

"The mysterious man is aboard the airship--hidden away!" cried Tom.
"That's what Eradicate was trying to call to our attention as we
started off. Eradicate saw his face at a rear window, and tried to warn
us! The mysterious man is a stowaway on board!"



Tom's excited announcement startled Mr. Damon and the others as much as
if the young inventor had informed them that the airship had exploded
and was about to dash with them to the earth. The men leaped to their
feet, and stared at the lad.

"A stowaway on board!" cried Mr. Damon.  "Bless my soul! How did he--"

"Are you sure that message is straight?" asked Mr. Jenks. "Did
Eradicate see the man?"

"He says he did," answered Tom. "The man is hidden away on board
now--probably among the stores and supplies."

"Bless my tomato sauce!" exploded Mr. Damon. "I hope he doesn't eat
them all up!"

"We must get him out at once!" declared Mr. Jenks.

"I knew something would happen on this voyage," came from Mr. Parker.
"I predicted it from the first!"

Tom thought considerable, but he did not answer the scientist just
then. Another communication was coming to him by wireless.  He listened

"Father says," the lad told his companions "that Eradicate only had a
glimpse of the man at the last moment. He was looking from the rear
storeroom window--he's the same man who called on me that time--Rad
remembers him very well."

"Bless my shoes! What's to be done?" inquired Mr. Damon, looking around

"We must get him out, that's all," decided Mr. Jenks; with vigor. "Get
him out and drop him overboard!"

"Drop him overboard!" cried Mr. Parker, in horror.

"Not exactly, but get rid of him," proceeded the diamond seeker. "That
man is one of my enemies. He has been sent by the band of diamond
makers hidden among the mountains, to spy on me, and, if possible,
prevent me from seeking to discover their secret. He tried to work on
Tom's Swift's fears, and frighten him from using his airship on this
quest. Then, when he failed, the man must have sneaked into the shed,
and hidden himself in the ship. We must get rid of him, or he may wreck
the Red Cloud!"

"That's so!" cried Tom. "We must try to capture him. I think we had
better--" the lad paused, and again listened to the wireless message.
"Father says Eradicate saw the man have a gun, so we must be careful,"
the young inventor translated the dots and dashes.

"Bless my powder horn!" exploded Mr. Damon.

"We shall have to proceed cautiously then," spoke Mr. Jenks.  "If he is
like any others in the gang he is a desperate man."

"Better sneak up on him then, if we can," proposed Mr. Parker.  "There
are enough of us to cope with one man, even if he is armed. You have
weapons aboard, haven't you?" he inquired of Tom.

"Yes," was the hesitating answer, "but I don't want to use them if I
can help it. Not only because of the danger, and a dislike of shedding
blood, but because a stray bullet might pierce the gas bag and damage
the ship."

"That's so," agreed Mr. Jenks. "Well, I guess if we go at it the right
way we can capture him without any shooting. But we must talk more
quietly--we ought to have whispered--he may have heard us."

"I don't think so," replied Tom. "The storeroom is far enough off so
that he couldn't hear us. Besides, the motor makes such a racket that
he couldn't distinguish what we were talking about, even if he heard
our voices. So, unless he heard the wireless working, and suspects
something from that, he probably doesn't know that we are aware of his
presence aboard."

"But why do you think he has remained quiet all this while, Tom?" asked
Mr. Damon.

"Probably he wants to wait until the ship is farther out west,"
suggested Mr. Jenks. "Then he will be nearer his friends, and can get
help, if he needs it."

"And do you really believe he would destroy the Red Cloud?" asked Mr.

"I think that all he is waiting for is a favorable chance," declared
the diamond seeker. "He would destroy the craft, and us too, if he
could prevent us from discovering the secret of Phantom Mountain, I

"Then we must get ahead of him," decided Tom, quietly. "I have just
flashed to dad a message, telling him that we will heed his warning.
Now to capture the stowaway!"

"And while we're about it, give him a good scare when we do get him,"
suggested Mr. Jenks.

"How?" asked Tom.

"Threaten to drop him overboard. Perhaps that will make him tell how he
happened to get in our ship, and what are the plans of the gang of
diamond makers. We may get valuable information that way."

"I don't believe you can scare such fellows much," was Tom's opinion,
but it was agreed to try.

"How are you going to capture him?" asked Mr. Parker. "If he has a gun
it won't be any too easy to go in the storeroom, and drag him out."

"We'll have to use a little strategy," decided Tom, and then they
discussed several plans. The one finally adopted was that Tom and Mr.
Damon should enter the storeroom, casually, as if in search of food to
cook for supper. They would discuss various dishes, and Mr. Damon was
to express a preference for something in the food line, the box
containing which, was well hack in the room. This would give the two a
chance to penetrate to the far end of the apartment, without arousing
the suspicions of the hidden man, who, doubtless, would be listening to
the conversation.

"And as soon as we get sight of him, you and I will jump right at him,
Mr. Damon," said Tom. "Jump before he has a chance to use his gun. Mr.
Jenks and Mr. Parker will be waiting outside the room, to catch him if
he gets away from us. I'll have some ropes ready, and we'll tie him up,
and--well, we'll decide later what to do with him."

"All right. I'm ready as soon as you are, Tom," said the eccentric man.
"Come ahead."

They went softly to the storeroom, and listened at the door.  There was
no sound heard save that made by the machinery.

"I wonder if he's really here?" whispered Mr. Damon.

"We'll soon find out," answered Tom. "Let's go in."

They entered, and, in pursuance of their plan, Tom and his friend
talked of various foods.

"I think I'd like some of that canned lobster, with French dressing
on," spoke the eccentric man.

"That's away in the back end of the room," said Tom, in a loud voice.
"It's under a lot of boxes."

"Then I'll help you get it out! Bless my frying pan! but I am very fond
of lobster!" exclaimed Mr. Damon, in as natural tones as was possible
under the circumstances.

He and Tom moved cautiously back among the boxes and barrels.  They
were glancing about with eager eyes. Tom switched on an electric light,
and, the instant he did so, he was aware of a movement in a little
space formed by one box which was placed on top, of two others. The lad
saw a dark figure moving, as if to get farther out of sight.

"I've got him!" cried Tom, making a dive for the shadow.

A moment later the young inventor was bowled over, as a dark figure
leaped over his head.

"Catch him, Mr. Damon!" he cried.

"Bless my hatband! I--I--" Mr. Damon's voice ended in a grunt.  He,
too, had been knocked down by the fleeing man.

"Look out, Mr. Jenks!" cried Tom, to warn those on guard at the door of
the storeroom.

There was the report of a gun, some excited shouts, and when Tom could
scramble to his feet, and rush out, he beheld Mr. Parker calmly sitting
on a struggling man, while Mr. Jenks held a gun, that was still smoking.

"We caught him!" cried the scientist.

"Anybody hurt?" asked Tom, anxiously.

"No, I knocked up his gun as he fired," explained Mr. Jenks.  "Where
are the ropes, Tom?"

The cords were produced and the man, who had now ceased to struggle,
was tightly bound. He uttered not a word, but he smiled grimly when Mr.
Damon remarked:

"I guess I'll go back in the storeroom, Tom, and see how much food he

"Oh, I guess he didn't take much," declared the lad. "He wasn't there
long enough."

"Well, Farley Munson, so it's you, is it?" asked Mr. Jenks, as he
surveyed the prisoner.

"Do you know him?" asked Tom, in some surprise.

"He was in with the diamond makers," said Mr. Jenks. "He was one of
those who took me to the secret cave. But it will be the last time he
ever goes there. How high up are we, Tom?"

"About two miles. Why?"

"I guess that will be far enough to let him fall," went on the diamond
seeker. "Come on, Mr. Damon, help me throw him overboard!"

"You--you're not going to throw me over--with the airship two miles
high; are you?" gasped the man.

"Will you tell us what we want to know, if we don't?" asked Mr. Jenks.

"What do you want to know?"

"How you got aboard, and what your object was in coming."

"That's easy enough. I had been hanging around the shed for several
days, watching a chance to get in. Finally I saw it, when that colored
man went to feed his mule, and I slipped in, and hid in the airship.
The stores were all in then, and I stowed myself away among the boxes.
I had food and water, so I didn't touch any of yours," and he looked at
Mr. Damon, who seemed much relieved.

"And what was your object?" demanded Mr. Jenks.

"I wanted to prevent you from going to Phantom Mountain."


"By destroying the airship if need be. But I hoped to accomplish it by
other means. I would have stopped at nothing, though, to prevent you.
You must keep away from there!"

"And if we refuse?" asked Tom.

"Then you'll have to take what comes!"

"But not from you!" exclaimed Mr. Jenks. "We're going to get rid of

The man's face showed the alarm he felt.

"Oh, don't worry," said Mr. Jenks, quickly, "we're not going to toss
you overboard. We're not as desperate as your crowd. But we're going to
get rid of you, and then go on before you can send any word to your
confederates. We'll put you off in the most lonesome spot we can find,
and I guess you'll be some time getting back to civilization. By that
time we'll have the secret of the diamonds."

"You never will!" declared the man, firmly. And he would say nothing
more, though by threats and promises Mr. Jenks tried to get from him
something about the men in with him, and where the cave of the diamonds
was located.

Heavily bound with ropes the man was locked in a small closet, to be
kept there until a favorable spot was reached for letting him go. Mr.
Jenks' plan, of dropping him down in some place where he would have
difficulty in sending on word to his confederates was considered a good

Three days later, in crossing over a lonely region, near the Nebraska
National Forest, Farley Munson, which was one of the names the spy went
by, was dropped off the airship, when it was sent down to within a few
feet of the earth.

"It will take you some time to get to a telegraph office," said Mr.
Jenks, as a package of food, and a flask of water was tossed down to
the stowaway. He shook his fist at those in the airship, and shouted
after them:

"You'll never discover the secret of Phantom Mountain!"

"Yes, we will," declared Tom, as he sent the Red Cloud high into the
air again.



During the three days when the stowaway had been kept a prisoner, the
Red Cloud had made good time on her western trip.  She was now about
two hundred and fifty miles from Leadville, Colorado, and Tom knew he
could accomplish that distance in a short time. It was necessary,
therefore, since they were so close to the place where the real search
would begin, to make some more definite plans.

"We will need to replenish our supply of gasoline," said Tom, shortly
after the stowaway had been dropped, and when the young inventor had
made a general inspection of the airship.

"Is it all gone?" inquired Mr. Damon.

"Not all, but we will soon be in the wildest part of the Rocky
Mountains, and gasoline is difficult to procure there. So I want to
fill all our reserve tanks. But I would rather do that before we get
far into Colorado."

"Why?" inquired Mr. Parker.

"Because airships are not so common but what the appearance of one
attracts attention. Ours is sure to be talked about, and commented on.
In that case, in spite of our precaution in putting Munson off in this
lonely place, word of the Red Cloud being in the vicinity of Leadville
may reach the diamond makers, and put them on their guard. We want to
take them unawares if we can."

"That's so," agreed Mr. Jenks. "We had better get our gasoline at the
first stopping place, then, and proceed with our search.  Our first
object ought to be to look for the landmark--the head of stone. Then we
can begin to prospect about a bit."

"My idea, exactly," declared Tom. "Well, then, I'll go down at the
first place we cross, where we can get gasoline, and then we'll be in a
position to hover in the air for a long time, without descending."

The airship kept on her way, traveling slowly the remainder of that
day, and at dusk, when there was less chance of big crowds seeing them,
the Red Cloud was sent down on the outskirts of a large village. Tom
and Mr. Damon went to a supply store, and arranged to have a sufficient
quantity of the gasoline taken out to the airship. It was delivered
after dark, and little talk was occasioned by the few who were aware of
the presence of the craft. Then, once more, they went aloft, and Tom
sent several wireless messages to Shopton, including one to Miss Nestor.

"Please tell my wife that I am well, and that I have a good appetite,"
said Mr. Damon.

Mr. Parker also sent a message to a scientific friend of his, stating
that he made some observations among the mountains, of the region in
which the airship then was, and that the indications were that a great
landslide would soon take place.

"That won't worry us," spoke Tom, "for we'll be far above it."

"I hope we will be near enough to enable me to observe it, and make
some scientific notes," came from Mr. Parker. "I am positive that one
of these mountain peaks that we saw to-day will disappear in a
landslide within a few days. I have an instrument somewhat like the one
that records earthquakes, and it has been acting strangely of late."

Tom wondered what enjoyment Mr. Parker got out of life, when he was
always looking for some calamity to happen, but the scientist seemed to
take as much pleasure in his gloomy forebodings now, as he had on
Earthquake Island.

They reached the vicinity of Leadville the next day, but took care to
keep high above the city, so that the airship could not be observed.
With powerful glasses they examined the mountainous country, looking
for the little settlement of Indian Ridge.

"There it is!" exclaimed Mr. Jenks, just as dusk was settling down. "I
can make out the hotel I stopped at. Now we can really begin our
search. The next thing is to find the stone head, and then, I think, I
will have my bearings."

"We'll begin the hunt for that landmark in the morning," said Tom.

High in the air hovered the Red Cloud. At that distance above the earth
she must have looked like some great bird, and the adventurers thought
it unlikely that any one in the vicinity of Leadville would observe

The quest for the great mountain peak, that looked like a stone head,
was under way. Back and forth sailed the airship. Sometimes she was
enveloped in fog, and no sight could be had of the earth below. At
other times there were rain storms, which likewise prevented a view.
Mr. Parker was on the lookout for his predicted mountain landslide, but
it did not occur, and he was much disappointed.

"It's queer I can't pick out that landmark," said Mr. Jenks after two
days of weary searching, when their eyes were strained from long
peering through telescopes. "I'm sure it was around Indian Ridge, yet
we've covered almost all the ground in this neighborhood, and I haven't
had a glimpse of it."

"Perhaps it was destroyed in a landslide, or some cataclysm of nature,"
suggested Mr. Parker. "That is very possible."

"If that's the case we're going to have a hard time to locate the cave
of the diamond makers," answered Mr. Jenks, "but I hope it isn't so."

They continued the search for another day, and then Tom, as they sat in
the comfortable cabin of the airship that night, hovering almost
motionless (for the motor had been shut down) made a proposition.

"Why not descend in some secluded place," he suggested, "and wander
around on foot, making inquiries of the miners. They may know where the
stone head is, or they may even know about Phantom Mountain."

"Good idea," spoke Mr. Jenks. "We'll do it."

Accordingly, the next morning, the Red Cloud was lowered in a good but
lonely landing place, and securely moored. It was in a valley, well
screened from observation, and the craft was not likely to be seen,
but, to guard against any damage being done to it by passing hunters or
miners, Mr. Parker and Mr. Damon agreed to remain on guard in it, while
Tom and Mr. Jenks spent a day or two traveling around, making inquiries.

The young inventor and his companion proceeded on foot to a small
settlement, where they hired horses on which to make their way about.
They were to be gone two days, and in that time they hoped to get on
the right trail.



It was a wild and desolate country in which Tom Swift and Mr. Jenks
were traveling. Villages were far apart, and they were at best but
small settlements. In their journeys from place to place they met few

But of these few they made cautious inquiries as to the location of
Phantom Mountain, or the landmark known as the great stone head.
Prospectors, miners and hunters, whom they asked, shook their heads.

"I've heard of Phantom Mountain," said one grizzled miner, "but I
couldn't say where it is. Maybe it's only a fish story--the place may
not even exist."

"Oh, it does, for I've been there!" exclaimed Mr. Jenks.

"Then why don't you go back to it?" asked the miner.

"Because I can't locate it again," was the reply.

"Humph! Mighty queer if you've seen a place once, and can't get to it
again," and the man looked as if he thought there was something strange
about Tom and his companion. Mr. Jenks did not want to say that he had
been taken to the mountain blindfolded, for that would have caused too
much talk.

"I think if we spent to-night in a place where the miners congregate,
listened to their talk, and put a few casual questions to them, more as
if we were only asking out of idle curiosity, we might learn
something," suggested Tom.

"Very well, we'll try that scheme."

Accordingly, after they had left the suspicious miner the two proceeded
to a small milling town, not far from Indian Ridge.  There they engaged
rooms for the night at the only hotel, and, after supper they sat
around the combined dance hall and gambling place.

There were wild, rough scenes, which were distasteful to Tom, and to
Mr. Jenks, but they felt that this was their only chance to get on the
right trail, and so they stayed. As strangers in a western mining
settlement they were made roughly welcome, and in response to their
inquiries about the country, they were told many tales, some of which
were evidently gotten up for the benefit of the "tenderfeet."

"Is there a place around here called Phantom Mountain?" asked Tom, at
length, as quietly as he could.

"Never heard of it, stranger," replied a miner who had done most of the
talking. "I never heard of it, and what Bill Slatterly don't know ain't
worth knowin'. I'm Bill Slatterly," he added, lest there be some doubt
on that score.

"Isn't there some sort of a landmark around here shaped like a great
stone head?" went on Tom, after some unimportant questions.  "Seems to
me I've heard of that."

"Nary a one," answered Mr. Slatterly. "No stone heads, and no Phantom
Mountains--nary a one.

"Who says there ain't no Phantom Mountains?" demanded an elderly miner,
who had been dozing in one corner of the room, but who was awakened by
Slatterly's loud voice. "Who says so?"

"I do," answered the one who claimed to know everything.

"Then you're wrong!" Tom's heart commenced beating faster than usual.

"Do you mean to say you've seen Phantom Mountain, Jed Nugg?" demanded

"No, I ain't exactly seen it, an' I don't want to, but there is such a
place, about sixty mile from here. Folks says it's haunted, and them
sort of places I steer clear from."

"Can you tell me about it?" asked Mr. Jenks, eagerly. "I am interested
in such things."

"I can't tell you much about it," was the reply, "and I wouldn't git
too interested, if I was you. It might not be healthy. All I know is
that one time my partner and I were in hard luck. We got grub-staked,
and went out prospectin'. We strayed into a wild part of the country
about sixty mile from here, and one night we camped on a mountain--a
wild, desolate place it was too."

The miner stopped, and began leisurely filling his pipe.

"Well?" asked Tom, trying not to let his voice sound too eager.

"Well, that was Phantom Mountain."

The miner seemed to have finished his story.

"Is that all?" asked Mr. Jenks. "How did you know it was Phantom

"'Cause we seen the ghost--my partner and I--that's why!" exclaimed the
man, puffing on his pipe. "As I said, we was campin' there, and 'long
about midnight we seen somethin' tall and white, and all shimmerin',
with a sort of yellow fire, slidin' down the side of the mountain It
made straight for our camp."

"Huh! Guess you run, didn't you, Jed?" asked Bill Slatterly.

"Course we did. You'd a run too, if you seen a ghost comm' at you, an'
firm' a gun."

"Ghosts can't fire guns!" declared Bill. "I guess you dreamed it, Jed."

"Ghosts can't fire guns, eh? That's all you know about it. This one
did, and to prove I didn't dream it, there was a bullet hole in my hat
next mornin'. I could prove it, too, only I ain't got that hat any
more. But that was Phantom Mountain, strangers, an' my advice to you is
to keep away from it. I was on it but I didn't exactly see it, 'cause
it was dark at the time."

"Was it near a peak that looked like a stone head?" asked Tom.

"It were, stranger, but I didn't take much notice of it. Me and my
partner got out of them diggin's next day, and I never went back. I
ain't never said much about this place, but it's called Phantom
Mountain all right, and I ain't the only one that's seen a ghost there.
Other grub-stakers has had the same experience."

"Why ain't I never heard about it?" demanded Bill, suspiciously.

"'Cause as why you're allers so busy talkin' that you don't never
listen to nothin' I reckon," was Jed's answer, amid laughter.

"Can you tell us what trail to take to get there?" asked Tom, of the

"Yes, it's called the old silver trail, and you strike it by goin' to a
place called Black Gulch, about forty mile from here.  Then it's twenty
mile farther on. But take my advice and don't go."

"Can it be reached by way of Indian Ridge?" asked Mr. Jenks, wondering
how he had been taken to the cave of the diamond makers. He did not
remember Black Gulch.

"Yes, you can git there by Indian Ridge way, but it's more dangerous.
You're likely to lose your way, for that's a trail that's seldom
traveled." Mr. Jenks thought that, perhaps, was the reason the gang had
taken him that way. "It's easier to get to the stone head and Phantom
Mountain by Black Gulch, but it ain't healthy to go there, strangers,
take my advice on that," concluded the miner, as he prepared to go to
sleep again.

Tom could scarcely contain the exultation he felt. At last, it seemed,
they were on the trail. He motioned to Mr. Jenks, and they slipped
quietly from the place, just as another dance was beginning.

"Now for Black Gulch!" cried Tom. "We must hurry back to the airship,
and tell the good news.

"It's too late to-night," decided Mr. Jenks, and so they waited until
morning, when they made an early start.

They found Mr. Damon and Mr. Parker anxiously awaiting their return.
Mr. Damon blessed so many things that he was nearly out of breath, and
Mr. Parker related something of the observations he had made.

"I think I have discovered traces of a dormant volcano," he said. "I am
in hopes that it will have an eruption while we are here."

"I'm not," spoke Tom, decidedly. "We'll start for Black Gulch as soon
as possible."

The airship once more rose in the air, and, following the directions
the miner had given him, Tom pointed his craft for the depression in
the mountains which had been given the name Black Gulch. It was reached
in a short time, and then, making a turn up a long valley the airship
proceeded at reduced speed.

"We ought to see that stone head soon now," spoke Tom, as he peered
from the windows of the pilot house.

"It's queer we didn't notice it when we were up in the air," remarked
Mr. Jenks. "We've been over this place before, I'm sure of it."

The next moment Mr. Damon uttered a cry. "Bless my watch-chain!" he
exclaimed. "Look at that!"

He pointed off to the left. There, jutting out from the side of a steep
mountain peak was a mass of stone--black stone--which, as the airship
slowly approached, took the form and shape of a giant's head.

"That's it! That's it!" cried Tom. "The great stone head!"

"And now for Phantom Mountain and the diamonds!" shouted Mr. Jenks, as
Tom let the airship slowly settle to the bottom of the valley.



Out from the Red Cloud piled Tom and the others. They made a rush for
the irregular mass of rock which bore so strong a resemblance to the
head of some gigantic man.

"That's the one! That's the thing I saw when they were taking me along
here blindfolded!" exclaimed Mr. Jenks. "I'm sure we're on the right
trail, now!"

"But what gets me, though," remarked Mr. Damon, "is why we couldn't see
that landmark when we were up in the air. We had a fine view, and ought
to have been able to pick it out with the telescopes."

The adventurers saw the reason a few seconds later. The image was
visible only from one place, and that was directly looking up the
valley. If one went too far to the right or left the head disappeared
from view behind jutting crags, and it was impossible to see it from
overhead, because the head was almost under a great spur of a mighty

"We might have hunted for it a week in the airship, and been directly
over it," said Tom, "and yet we would never have seen it."

"Yes, but we never would have gotten here in such good shape if it
hadn't been for your wonderful craft," declared Mr. Jenks. "It brought
us here safely and quickly, and enabled us to elude the men who tried
to keep us back. We're here in spite of them. If we had traveled by
train they might have interfered with us in a dozen ways."

"That's so," agreed Mr. Damon. "Well, now we're here, what's to be
done? Which way do we start to reach the cave where the diamonds are
manufactured, Mr. Jenks?"

"That I can't say. As you know, I only had a momentary glimpse of this
stone head as they wore taking me along the trail. Then one the men
noticed that the bandage had slipped and he pulled it into place. So I
really can't say which direction to take now, in order to discover the

"How long after you saw the head before you reached the cave?" asked
Tom. "In that way we may be able to tell how far away it is."

"Well, I should say it was about two or three hours after I saw the
head, before we got to the halting place, and I was carried into the
cave. That would make it several miles from here, for we went in a

"Yes, and they might have driven in a round-about way, in order to
deceive you," suggested Mr. Damon. "At best we have but a faint idea
where the diamond cave is, but we must search for it; eh, Tom?"

"Certainly. We'll start right in. And as the airship will be of but
little service to us now, I suggest that we leave it in this valley. It
is very much secluded, and no one will harm it, I think. We can then
start off prospecting, for I have a large portable tent, and we can
carry enough food with us, with what game we can shoot, to enable us to
live. I have a regular camping outfit on board."

"Fine!" cried Mr. Parker, "and that will give me a chance to make some
observations among the mountains, and perhaps I can predict when a
landslide, or an eruption of some dormant volcano, may occur."

"Bless my stars!" cried Mr. Damon. "I don't wish you any bad luck, Mr.
Parker, but I sincerely hope nothing of the sort happens! We had enough
of that on Earthquake Island!"

"One can not halt the forces of nature," said the scientist, solemnly.
"There are many towering peaks around here which may contain old
volcanoes. And I notice the presence of iron ore all about. This must
be a wonderful place in a thunder and lightning storm."

"Why?" asked Tom, curiously.

"Because lightning would be powerfully attracted here by the presence
of the metal. In fact there is evidence that many of the peaks have
been struck by lightning," and the scientist showed curious, livid
scars on the stone faces of the peaks within sight.

"Then this is a good place to stay away from in a storm," observed Mr.
Damon. "However, we won't worry about that now. If this is the landmark
Mr. Jenks was searching for, then we must be in the vicinity of Phantom

"I think we are," declared the diamond seeker. "Probably it is within
sight now, but there are so many peaks, and this is such a wild and
desolate part of the country that we may have trouble in locating it."

"We've got to make a beginning, anyhow," decided Tom, "and the sooner
the better. Come, we'll make up our camping kits, and start out."

It was something to know that they were on the right trail, and it was
a relief to be able to busy oneself, and not be aimlessly searching for
a mysterious landmark. They all felt this, and soon the airship was
taken to a secluded part of the valley, where it was well hidden from
sight in a grove of trees.

Tom and Mr. Damon then served a good meal, and preparations were made
to start on their search among the mountains--a search which they hoped
would lead them to Phantom Mountain, and the cave of the diamond makers.

The tent which would afford them shelter was in sections, and could be
laced together. They carried food, compressed into small packages,
coffee, a few cooking utensils; and each one had a gun, Tom carrying a
combination rifle and shotgun, for game.

"We can't live very high while we're on the trail," said the young
inventor, "but it won't be much worse than it was on Earthquake Island.
Are we all ready?"

"I guess so," answered Mr. Damon. "How long are we going to be away?"

"Until we find the diamond makers!" declared Tom, firmly.

Shouldering their packs, the adventurers started off. Tom turned for a
last look at his airship, dimly seen amid the trees.  Would he ever
come back to the Red Cloud? Would she be there when he did return?
Would their quest be successful? These questions the lad asked himself,
as he followed his companions along the rocky trail.

"Perhaps we can find the road by which these men go in and out of the
cave," suggested Mr. Damon, when they had gone on for several miles.

"I fancy not," replied Mr. Jenks. "They probably take great pains to
hide it. I think though, that our best plan will be to go here and
there, looking for the entrance to the cave. I believe I would remember
the place."

"But why can't you follow the directions given by the miner who told
you about Phantom Mountain?" asked Mr. Damon.

"Because his talk was too indefinite," answered Mr. Jenks. "He was so
frightened by seeing what he believed to be a ghost, that he didn't
take much notice of the location of the place. All he knows is that
Phantom Mountain is somewhere around here."

"And we've got to hunt until we find it; is that the idea?" asked Mr.

"Or until we see the phantom," added Tom, in a low voice.

"Bless my topknot!" exclaimed Mr. Damon. "You don't mean to say you
expect to see that ghost; do you Tom?"

"Perhaps," answered the young inventor, and he did not add something
else of which he was thinking. For Tom had a curious theory regarding
the phantom.

They tramped about the remainder of that day. Toward evening Tom shot
some birds, which made a welcome addition to their supper. Then the
tent was put together, some spruce and hemlock boughs were cut to make
a soft bed, and on these, while the light of a campfire gleamed in on
them, the adventurers slept.

Their experience the following day was similar to the first.  They saw
no evidence of a large cave such as Mr. Jenks had described, nor were
there any traces of men having gone back and forth among the mountains,
as might have been expected of the diamond makers, for, as Mr. Jenks
had said, they made frequent journeys to the settlement for food, and
other supplies.

"Well, I haven't begun to give up yet," announced Tom, on the third
day, when their quest was still unsuccessful. "But I think we are
making one mistake."

"What is that?" inquired Mr. Jenks.

"I think we should go up higher. In my opinion the cave is near the top
of some peak; isn't it, Mr. Jenks?"

"I have that impression, though, as you know, I never saw the outside
of it. Still, it might not be a bad idea to ascend some of these peaks."

Following this suggestion, they laid their trail more toward the sky,
and that night found them encamped several thousand feet above the
sea-level. It was quite cool, and the campfire was a big one about
which they sat after supper, talking of many things.

Tom did not sleep well that night. He tossed from side to side on the
bed of boughs, and once or twice got up to replenish the fire, which
had burned low. His companions were in deep slumber.

"I wonder what time it is?" mused Tom, when he had been up the third
time to throw wood on the blaze. "Must be near morning." He looked at
his watch, and was somewhat startled to see that it was only a little
after twelve. Somehow it seemed much later.

As he was putting the timepiece back into his pocket the lad looked
around at the dark and gloomy mountains, amid which they were encamped.
As his gaze wandered toward the peak of the one on the side of which
the tent was pitched, he gave a start of surprise.

For, coming down a place where, that afternoon, Tom had noticed a sort
of indefinite trail was a figure in white. A tall, waving figure, which
swayed this way and that--a figure which halted and then came on again.

"I wonder--I wonder if that can be a wisp of fog?" mused the young
inventor. He rubbed his eyes, thinking it might be a swirling of the
night mist or a defect of vision. Then, as he saw more plainly, he
noticed the thing in white rushing toward him.

"It's the phantom--the phantom!" cried Tom, aloud. "It's the thing the
miner saw! We're on Phantom Mountain now!"



Tom's cries awakened the sleepers in the tent. Mr. Damon was the first
to rush out.

"Bless my nightcap, Tom!" he cried. "What is it? What has happened? Are
we attacked by a mountain lion?"

For answer the young inventor pointed up the mountain, to where, in the
dim light from a crescent moon, there stood boldly revealed, the figure
in white.

"Bless--bless my very existence!" cried the odd man. "What is it, Tom?"

"The phantom," was the quiet answer. "Watch it, and see what it does."

By this time Mr. Jenks and Mr. Parker had joined Tom and Mr. Damon. The
four diamond seekers stood gazing at the apparition.  And, as they
looked, the thing in white, seemingly too tall for any human being,
slid slowly forward, with a gliding motion. Then it raised its long,
white arms, and waved them threateningly at the adventurers.

"It's motioning us to go back," said Mr. Parker in an awed whisper. "It
doesn't want us to go any farther."

"Very likely," agreed Tom, coolly. "But we're not going to be
frightened by anything like that; are we?"

"Not much!" exclaimed Mr. Jenks. "I expected this. A ghost can't drive
me back from getting my rights from those scoundrels!"

"Suppose it uses a revolver to back up its demand?" asked the scientist.

"Wait until it does," answered Mr. Jenks. But the figure in white
evidently had no such intentions. It came on a little distance farther,
still waving the long arms threateningly, and then it suddenly
disappeared, seeming to dissolve in the misty shadows of the night.

"Bless my suspenders!" cried Mr. Damon. "That's a very strange
proceeding! Very strange! What do you make of it, Tom?"

"It is evidently some man dressed up in a sheet," declared Mr. Jenks.
"I expected as much."

"The work of those diamond makers; do you think?" continued Mr. Damon.

"I believe so," answered Tom, slowly, for he was trying to think it
out. "I believe they are the cause of the phantom, though I don't know
that it's a man dressed in a sheet."

"Why isn't it?" demanded Mr. Jenks.

"Because it was too tall for a man, unless he's a giant."

"He may have been on stilts," suggested Mr. Parker.

"No man on stilts could walk along that way," declared Tom,
confidently. "He glided along too easily. I am inclined to think it may
be some sort of a light."

"A light?" queried Mr. Damon.

"Yes, the diamond makers may be hidden in some small cave near here,
and they may have some sort of a magic lantern or a similar
arrangement, for throwing a shadow picture. They could arrange it to
move as they liked, and could cause it to disappear at will.  That, I
think, is the ghost we have just seen."

"But the diamond makers have only been in this mountain recently,"
objected Mr. Jenks, "and the phantom was here before them. In fact,
that was what gave the place its name."

"That may be," admitted the lad. "There are many places that have the
name of being haunted, but no one ever sees the ghost.  It is always
some one else, who has heard of some one who has seen it. That may have
been the case here. I grant that this place may have been called
'Phantom Mountain' for a number of years, due to the superstitious
tales of miners. The diamond makers came along, found the conditions
just right for their work, and adopted the ghost, so to speak. As there
wasn't any real spirit they made one, and they use it to scare people
away.  I think that's what we've just seen, though I may be wrong in my
theory as to what the phantom is."

"Well, it's gone now, at any rate," said Mr. Jenks, "and I think we'd
better get back inside the tent. It's cold out here."

"Aren't some of us going to stand guard?" demanded Mr. Damon.

"What for?" asked Mr. Jenks.

"Why--er--bless my key-ring! Suppose that ghost takes a notion to come
down here, and use his gun, as he did on the miners?"

"I don't believe that will happen," remarked Tom. "The diamond makers,
if the white thing had anything to do with them, have given us a
warning, and I think they'll at least wait until morning to see how we
heed it."

"We aren't going to heed it!" burst out Mr. Jenks. "I'm going to go
right ahead and find that cave where they make diamonds!"

"And we're with you!" exclaimed Tom. "We'll have a good fire going the
rest of the night, and that may keep intruders away. In the morning
we'll begin our search, and we'll go up the trail where we saw the
white figure."

A big pile of wood had been collected for the fire, and Tom now piled
some logs and branches on the blaze. It would last for some time now,
and the adventurers, still talking of the "ghost" went back into the
tent. It was over an hour before they all got to sleep again, and Mr.
Jenks and Mr. Damon took turns in getting up once or twice during the
remainder of the night to replenish the fire.

Morning dawned without anything further having occurred to disturb
them, and, after a hearty breakfast, to which Tom added some fish he
caught in a nearby mountain stream, they set off up the trail on
Phantom Mountain.

They had left their tent standing, as they proposed making that spot
their headquarters until they located the cave they were seeking. What
their course would be after that would depend on the circumstances.

If they had expected to have an easy task locating the cavern in which
Mr. Jenks had seen diamonds made, the adventurers were disappointed.
All that day they tramped up and down the mountain, looking for some
secret entrance, but none was disclosed. The higher they went up the
great peak, the fainter became the trail, until, at length it vanished

But this was not to be wondered at, since it was on solid rock, in
which no footsteps would leave an impression.

"They never brought you up here in a wagon, Mr. Jenks," decided Tom,
when he saw how steep the place was.

"I'm inclined to think so myself," admitted the diamond man.  "They
must have reached the cave from some other way. As a matter of fact, I
walked some distance after getting out of the vehicle, before we got to
the cavern. But, even at that, I don't believe we came this way."

"Yet the phantom was here," persisted Tom, "and I'm convinced that the
cave is in this neighborhood. It's up to us to find it!"

But they searched the remainder of that day in vain, and as night was
coming on, they made their way back to the camp. As Tom, who was in the
lead, approached the tent, he saw something black fastened to the

"Hello!" he cried. "Some one's been here. That wasn't on the tent when
he left this morning."

"What is it?" asked Mr. Damon.

"A black piece of paper, written on with white ink," replied the lad.
He was reading it, and, as he perused it a look of surprise came over
his face.

"Listen to this!" called Tom. "It's evidently from the diamond makers."

Holding up the black paper, on which the white writing stood out in
bold relief Tom read aloud:

"Be warned in time! Go back before it is too late! You are near to
death! Go back!"

"Bless my shoelaces!" cried Mr. Damon. "This is getting serious."



Gathered about the young inventor, the three men looked at the warning.
The writing was poor, and it was evident that an attempt had been made
to disguise it. But there was no misspelling of words, and there were
no rudely drawn daggers, or bloody hands or anything of that sort. In
fact, it was a very business-like sort of warning.

"Rather odd," commented Mr. Jenks. "Black paper and white ink."

"White ink is easy enough to make," stated Mr. Parker. "I fancy they
wanted it as conspicuous as possible."

"Yes," agreed Tom, "and this warning, together with the antics of the
thing in white last night, shows that they are aware of our presence
here, and perhaps know who we are. We will have to be on our guard."

"Do you think that fellow Munson, whom we left in the forest, could
have gotten here and warned them?" asked Mr. Damon.

"It's possible," admitted Tom, "but now let's see if the person who
pinned this warning on our tent took any of our things."

A hasty examination, however, showed that nothing had been disturbed,
and Tom and Mr. Damon were soon getting supper ready, everyone talking,
during the progress of the meal, about the events of the day, and the
rather weird culmination of it.

"Well, we haven't had a great deal of success--so far," admitted Tom,
as they sat about the fire, in the fast gathering dusk. "I think,
perhaps, we'd better try on the other side of the mountain to-morrow.
We've explored this side pretty thoroughly."

"Good idea," commented Mr. Jenks. "We'll do it, and move our camp. I
only hope those fellows don't find our airship and destroy it. We'll
have a hard time getting back to civilization again, if we have to walk
all the way."

This contingency caused Tom some uneasiness. He did not like to think
that the unscrupulous men might damage the Red Cloud, that had been
built only after hard labor. But he knew he could accomplish nothing by
worrying, and he tried to dismiss the matter from his mind.

They rather expected to see the thing in white again that night, but it
did not appear, and morning came without anything having disturbed
their heavy sleep, for they were tired from the day's tramp.

It took them the greater part of the day to make a circuit of the base
of Phantom Mountain in order to get to a place where a sort of trail
led upward.

"It's too late to do anything to-night," decided Tom, as they set up
the tent. "We'll rest, and start the first thing in the morning."

"And the ghost isn't likely to find us here," added Mr. Damon.  "Where
are you going, Mr. Parker?" he asked, as he saw the scientist tramping
a little way up the side of the mountain.

"I am going to make some observations," was the answer, and no one paid
any more attention to him for some time. Supper was nearly ready when
Mr. Parker returned. His face wore a rather serious air, and Mr. Damon,
noting it, asked laughingly:

"Well, did you discover any volcanoes, that may erupt during the night,
and scare us to death?"

"No," replied Mr. Parker, calmly, "but there is every indication that
we will soon have a terrific electrical storm.  From a high peak I
caught a glimpse of one working this way across the mountains."

"Then we'd better fasten the tent well down," called Tom. "We don't
want it to blow away."

"There will not be much danger from wind," was Mr. Parker's opinion.

"From what then?" asked Mr. Jenks.

"From the discharges of lightning among these mountain peaks, which
contain so much iron ore. We will be in grave danger."

The fact that the scientist had not always made correct predictions was
not now considered by his hearers, and Tom and the two men gazed at Mr.
Parker in some alarm.

"Is there anything we can do to avoid it?" asked Mr. Jenks.

"The only thing to do would be to leave the mountain," was the answer,
"and, as the iron ore extends for miles, we can not get out of the
danger zone before the storm will reach us. It will be here in less
than half an hour."

"Then we'd better have supper," remarked Tom, practically, "and get
ready for it. Perhaps it may not be as bad as Mr. Parker fears."

"It will be bad enough," declared the gloomy scientist, and he seemed
to find pleasure in his announcement.

The meal was soon over, and Tom busied himself in looking to the guy
ropes of the tent, for he feared lest there might be wind with the
storm. That it was coming was evident, for now low mutterings of
thunder could be heard off toward the west.

Black clouds rapidly obscured the heavens, and the sound of thunder
increased. Fitful flashes of lightning could be seen forking across the
sky in jagged chains of purple light.

"It's going to be a heavy storm," Tom admitted to himself. "I hope
lightning doesn't strike around here."

The storm came on rapidly, but there was a curious quietness in the air
that was more alarming than if a wind had blown. The campfire burned
steadily, and there was a certain oppressiveness in the atmosphere.

It was now quite dark, save when the fitful lightning flashes came, and
they illuminated the scene brilliantly for a few seconds. Then, by
contrast, it was blacker than ever.

Suddenly, as Tom was gazing up toward the peak of Phantom Mountain, he
saw something that caused him to cry out in alarm.  He pointed upward,
and whispered hoarsely:

"The ghost again! There's our friend in white!"

The others looked, and saw the same weird figure that had menaced them
when they were encamped on the other side of the peak.

"They must have followed us," said Mr. Jenks, in a low voice.

Slowly the figure advanced, It waved the long white arms, as if in
warning. At times it would be only dimly visible in the blackness,
then, suddenly it would stand out in bold relief as a great flash of
fire split the clouds.

The thunder, meanwhile, had been growing louder and sharper, indicating
the nearer approach of the storm. Each lightning flash was followed in
a second or two, by a terrific clap. Still there was no wind nor rain,
and the campfire burned steadily.

All at once there was a crash as if the very mountain had split
asunder, and the adventurers saw a great ball of purple-bluish fire
shoot down, as if from some cloud, and strike against the side of the
crag, not a hundred feet from where stood the ghostly figure in white.

"That was a bad one," cried Mr. Damon, shouting so as to be heard above
the echoes of the thunderclap.

Almost as he spoke there came another explosion, even louder than the
one preceding. A great ball of fire, pear shaped, leaped for the same
spot in the mountain.

"There's a mass of iron ore there!" yelled Mr. Parker. "The lightning
is attracted to it!"

His voice was swallowed up in the terrific crash that followed, and, as
there came another flash of the celestial fire, the figure in white
could be seen hurrying back up the mountain trail. Evidently the
electrical storm, with lightning bolts discharging so close, was too
much for the "ghost."

In another instant it looked as if the whole place about where the
diamond seekers stood, was a mass of fire. Great forked tongues of
lightning leaped from the clouds, and seemed to lick the ground. There
was a rattle and bang of thunder, like the firing of a battery of guns.
Tom and the others felt themselves tingling all over, as if they had
hold of an electrical battery, and there was a strong smell of sulphur
in the air.

"We are in the midst of the storm!" cried Mr. Parker. "We are standing
on a mass of iron ore! Any minute may be our last!"

But fate had not intended the adventurers for death by lightning.
Almost as suddenly as it had begun, the discharge of the tongues of
fire ceased in the immediate vicinity of our friends. They stood
still--awed--not knowing what to do.

Then, once more, came a terrific clap! A great mass of fire, like some
red-hot ingot from a foundry, was hurled through the air, straight at
the face of the mountain, and at the spot where the figure in white had
stood but a few minutes before.

Instantly the earth trembled, as it had at Earthquake Island, but it
was not the same. It was over in a few seconds. Then, as the diamond
seekers looked, they saw in the glare of a score of lightning flashes
that followed the one great clap, the whole side of the mountain slip
away, and go crashing into the valley below.

"A landslide!" cried Mr. Parker. "That is the landslide which I
predicted! The lightning bolt has split Phantom Mountain!"



For a time the roiling, slipping, sliding and tumbling of the mass of
earth and stones, down the side of the mountain, effectually drowned
all other sounds. Even the thunder was stilled, and though Tom and his
companions called to one another in terror, their voices could not rise
above that terrific tumult.

Finally, when they found that the direction of the slide was away from
their tent, and that they were not likely to be engulfed, they grew
more calm.

Gradually the noise subsided. The great boulders had rolled to the
bottom of the valley, and now only a mass of earth and stones was
sliding down. Even this stopped in about five minutes, and, as though
satisfied with what it had done, the electrical storm passed. Not a
drop of rain had fallen.

"Bless my shirt studs!" exclaimed Mr. Damon, who was the first to speak
after the din had quieted. "Bless my soul! But that was awful!"

"It was just what I expected," said Mr. Parker, calmly. "I knew, from
my observations, that we were in a region where landslides and terrific
electrical storms may be expected at any time. I fully looked for this."

"Well," remarked Mr. Jenks, rather sarcastically, "I hope it came up to
your expectations, Mr. Parker."

"Oh, fully," was the answer, "though I wish it could have happened in
daylight, so that I could better have observed certain phenomena
regarding the landslide. They are very interesting."

"At a distance," admitted Tom, with a laugh of relief. "Well, I'm glad
it's over, though we'll have to wait until morning to see what damage
has been done. Lucky we weren't struck by lightning. I never saw such

"Me, either!" declared Mr. Damon. "This mountain seems to attract them."

"It is like a magnet," said Mr. Parker. "I think I shall be able to
make some fine observations here."

"If we live through it," murmured Mr. Jenks.

They watched the play of lightning about a distant bank of clouds, but
the storm was now far away, only a faint rumbling of thunder being

"I'm wondering what happened to the phantom," said Tom, after a pause.
"Seems to me he was right in that track of the storm."

"Do you think it was a 'he'?" asked Mr. Jenks.

"I think we'll find that it's some sort of a man," answered the young
inventor. "We may find out very soon, now. I've changed my theory about
the ghost being reflections of light."

"How's that?" Mr. Damon wanted to know.

"Well, I think we are on the side of Phantom Mountain where the diamond
cave is," went on the lad. "The fact that the phantom appeared here,
soon after we arrived, shows that the men kept close track of our
movements. It also shows, I think, that the phantom did not have to
travel far to be on the spot, whereas we had to make quite a trip to
get around the base of the mountain.  I think the cave is up there,"
and Tom pointed toward the spot where the weird figure had been last
seen, before the storm drove it back.

"There may be two phantoms," suggested Mr. Jenks. "They may keep one on
this side of the mountain, and one on the other, to warn intruders away.

"It's possible," admitted Tom. "Well, we'll see how things look in the
morning, when we'll take up our march again, and go up the mountain.
We'll reach the top, if possible, which we couldn't do from the other
side, as it was too steep."

"I hope we shall be able to go forward in the morning," came from Mr.

"What do you mean?" asked the lad, struck by a peculiar significance in
the diamond man's tones.

"Why, that landslide may have opened a great gully in the side of
Phantom Mountain, which will prevent us from passing. It was a terrific
lot of earth and stones that slid away," answered Mr. Jenks.

"It certainly was," agreed Mr. Parker. "I would not be surprised if the
mountain was half destroyed, and it may be that the diamond cave no
longer exists."

"Not very cheerful, to say the least," murmured Mr. Jenks to Tom, and,
as it was getting quite chilly, following the storm, they went inside
the tent.

Tom could hardly wait for daylight, to get up and see what havoc the
landslide had wrought. As soon as the first faint flush of dawn showed
over the eastern peaks, he hurried from the tent.  Mr. Damon heard him
arise, and followed.

A curious scene met their eyes. All about were great rocks rent and
torn by the awful power of the lightning. The fronts of the stone
cliffs were scarred and burned by the electrical fire, and fantastic
markings, grotesque faces, and leering animals seemed to have been
drawn by some gigantic artist who used a bolt from heaven for his brush.

But the eyes of Tom and Mr. Damon took all this in at a glance, and
then their gaze went forward to where the avalanche had torn away a
great part of the mountain.

"Whew! I should say it was a landslide!" cried Tom.

"Bless my wishbone, yes!" agreed Mr. Damon.

Below them, in the valley, lay piled immense masses of earth and
stones. Boulders were heaped up on boulders, and rocks upon rocks,
being tossed about in heaps, strung about in long ridges, and swirled
about in curves, as though some cyclone had toyed with them after the
lightning flash had tossed them there.

"But the mountain isn't half gone," said Tom, as his eyes took in what
was left of the phantom berg. "I guess it will take a few more bolts
like that one, to put this hill out of business."

Though the landslide had been a great one, the larger part of the
mountain still stood. An immense slice had been taken from one side,
but the summit was untouched.

"And there's where the diamond cave is!" cried Tom, pointing to it.

"I think so myself," agreed Mr. Jenks, who came from the tent at that
moment, and joined the lad and Mr. Damon. "I think we shall find the
cave somewhere up there. We must start for it, as soon as we have
eaten, and we may reach it by night."

The three stood gazing up toward the summit of the great mountain.
Suddenly, as the sun rose higher in the heavens, it sent a shaft of
rosy light on the face of the berg that had been scarred by the
landslide. Tom Swift uttered an exclamation, and pointed at something.

"See!" he cried. "Look where the trail is--the trail down which the
phantom must have come. It is on the edge of a cliff now!"

They looked, and saw that this was so. The increasing light had just
revealed it to them. When the lightning bolt had torn away a great
portion of the mountain it had cut sheer down for a great depth and
when the earth and stones fell away they left a narrow pathway, winding
around the mountain, but so near the edge of a great chasm, that there
was room but for one person at a time to walk on that footway. The
uncertain trail up Phantom Mountain had all but been destroyed.

"The way up to the peak is by that path, now," spoke Tom, in a low

"Bless my soul!" cried Mr. Damon. "It's as much as a man's life is
worth to attempt it. If he got dizzy, he'd topple over, and fall a
thousand feet. Dare we risk it?"

"It's the only way to get up," went on Tom. "It's either that way, or
not at all. We've tried the other side without success.  We must go up
this way--or turn back."

"Then we'll go up!" cried Mr. Jenks. "It may not be as dangerous as it
looks from here."

But it was even more dangerous than it appeared, when they went part
way up it after a hasty breakfast. The trail was a mere ledge of rock
now, and in some places, to get around a projecting edge of the
mountain, they had to stand with their backs to the dizzy depths at
their feet, and with both arms outstretched work their way around to
where the trail was wider.

"Shall we risk it?" asked Tom, when they had tried the way, and found
it so dangerous. "We can't take anything with us--even our guns, for we
couldn't carry them, and if we reach the month of the cave, and find
those men there--"

He paused significantly. The adventurers looked at one another.  The
search for the diamond makers was becoming more and more dangerous.

"I say let's go on!" decided Mr. Damon, suddenly. "We want to locate
that cave, first of all. Perhaps, when we do find it, we may see some
easier way of getting to it than this. And if those diamond makers do
attack us--well, I don't believe they'll shoot defenseless men, and
they may listen to reason, and give Mr. Jenks his rights--tell him how
to make diamonds in return for the money he gave them."

"I don't believe those scoundrels will listen to reason," replied the
diamond man, "but I agree with Mr. Damon that we ought to go on. We may
find some other means of reaching the cave--if we can discover it, and
we'll take a chance with the men."

"Forward it is, then!" cried Tom. "I have a revolver, and I can supply
one of you gentlemen with another. They may come in useful in an
emergency. Let's go back to camp, take a little lunch in our pockets,
and try to scale the mountain."

They were soon on their way up the dizzy path once more, and, as they
advanced, they found it growing more and more dangerous.  In some
places they found it almost impossible to get around certain corners,
where there was barely room for their feet. As Tom remarked grimly, a
fat man never could have done it.  Fortunately they were all
comparatively thin, for their hard work, and not too abundant food,
since they had left the airship, had reduced their weight.

Up and up they went, higher and higher, sometimes finding the path wide
enough for two to walk abreast, and again seeing it narrow almost to a
ribbon. They hardly dared look down into the chasm at their left--a
chasm filled, in part, with the rocks and boulders tossed into it by
the lightning bolt.

Tom was in the lead, and had just made a dangerous turn around a
shoulder of rock--one of those places where he had to extend both arms,
and fairly hug the cliff before he could get around.

But, when he had made it, and found himself on a broad pathway, cut in
the living rock, he gave a great shout--a shout that caused his
companions to hasten to his side. They found the young inventor
pointing to a clump of bushes and small trees.

But it was not the shrubbery that Tom desired to call to their
attention. They saw that in an instant, for, dimly seen through the
leaves, was something black, and, as they looked more closely, they saw
that it was a great hole in the side of the mountain--a vast cavern,
opening like a tunnel.

"The cave! The cave!" cried Tom. "The diamond makers' cave!"

Hardly had he spoken than two men, each one carrying a gun, showed
themselves in the mouth of the cavern, and, instant later they both ran
toward the little party of adventurers.



Surprise held Tom and his friends almost spellbound for the moment. The
young inventor's hand went toward the pocket where he carried his
revolver. Mr. Jenks, who had the only other weapon, sought to draw it,
but he was stopped by a gesture of one of the two men with guns.

"Hold on, strangers!" the man cried. "I know what you're up to!  Better
not try to draw anything--it might not be healthy. Now, then, who are
you, and what do you want?"

The question came rather as a surprise, at least to Tom and Mr. Jenks.
They had taken it for granted that these men--if they were the diamond
makers--would know Mr. Jenks, and guess at his errand in coming back to
Phantom Mountain. But, it seemed, that they took them all for casual

No one answered for a moment. Tom caught the eye of Mr. Jenks, and
there was a look of hope in it. If ever there was a time for strategy,
it was now. Evidently Munson, the stowaway on the airship, had not yet
been able to send a warning to his confederates. And neither of the two
men recognized Mr. Jenks as the man who had been defrauded of his
rights. It might be possible to conceal the real object of the
adventurers until they had time to formulate a plan of action.

"Well," exclaimed the man with the gun, impatiently, "I ask you folks a
question. What do you want?"

Fortunately, neither Mr. Damon nor Mr. Parker replied. The former
because he deferred to Tom and Mr. Jenks, and the scientist because he
was busy inspecting some curious rocks he picked up. As it turned out
this was the luckiest thing he could have done. It lent color to what
Mr. Jenks said a moment later.

"What are you doing up here?" demanded the man again. "Don't you know
this is private property?"

"We--we were just looking around," answered Mr. Jenks, which was true
enough; as far as it went.

"Prospecting," added Tom.

"After gold?" demanded the second man, suspiciously.

"We'd be glad to find some," retorted the lad. At that moment Mr.
Parker began breaking off bits of rock with a small geologist's hammer
which he carried. The men with the guns looked at him.

"So you think you'll find gold up here?" asked the one who had first

"Is there any?" inquired Tom, trying to make his voice sound eager.

"Nary a bit, strangers," was the answer, and the two men laughed
heartily. "Now, we don't want to seem harsh," went on the man who
seemed to be the spokesman, "but you'd better get away from here. This
is private ground, and dangerous too--how'd you ever get up the
trail--we heard it was destroyed."

"There is still a narrow path," said Mr. Jenks. "We came up that--the
lightning and landslide haven't left much of it, though."

Mr. Parker looked quickly up from the rocks at which he was tapping
with his small hammer. "You have terrific lightning up here," he said.
"I am much interested in it, from a scientific standpoint. I predict
that some day the entire mountain will be destroyed by a blast from the

"I hope it won't be right away," spoke one of the men. "Now I guess you
folks had better be leaving while there's a path left to go down by."

"Might I ask," broke in Mr. Parker, as calmly as though he was
lecturing to a class of students, "might I ask if you have noticed any
peculiar effect of the lightning up here on the summit of the mountain?
Does it fuse and melt rocks, so to speak?"

"What's that?" cried the spokesman, with a sudden flash of anger. The
two men looked at each other.

"I wanted to know, merely for scientific reasons, whether the lightning
up here ever melted rocks?" repeated Mr. Jenks.

"Well, whether it's for scientific reasons or for any other, I'm not
going to answer you!" snapped the man. "It's none of your affair what
the lightning does up here. Now you'd all better 'vamoose'--clear out!"

"All right--we'll go," said Tom, quickly, at the same time motioning to
Mr. Jenks to agree with him. The eyes of the young inventor were roving
about. He saw what looked like a second trail, leading down the
mountain, from the far side of the cave.  He was convinced now that
there was another way to get to it.  Possibly they might find it. At
any rate nothing more could be done now. They must go back, for the
cavern was too well guarded to attempt to enter it by force--at least
just yet.

"Yes, we'll go back," assented Mr. Jenks.

Mr. Parker was tapping away at the rocks. He looked toward the black
mouth of the big cave. On what corresponded to the roof of it, some
distance back from the entrance, he saw a slender metal rod sticking up
into the air.

"May I ask if that's a lightning rod?" he inquired innocently.  "If it
is, I should like to ask about its action in a mountain that is so
impregnated with iron ore.

"You may ask until you get tired!" cried the spokesman, again showing
unreasoning anger, "but you'll get no answer from us. Now get away from
here before we do something desperate. You're on private ground and
you're not wanted. Clear out while you have the chance."

There was no help for it. Slowly our friends turned and began to go
down the dangerous trail. They were soon out of sight of the two men
who stood before the cave, with their guns ready, but neither Tom nor
any of his companions spoke for some time.

When they had rounded one of the most dangerous turns the young
inventor sat down to rest, an example followed by the others.

"Well," asked Tom, "do you think those are some of the diamond makers,
Mr. Jenks?"

"I certainly do, though I never saw those two men before. If I could
once get inside the cave, I could tell whether or not it was the one
where I was practically held a prisoner. But I'm sure it is. I know
some of the men used to go off every day with guns, and not come back
until night. I have no doubt they were on guard, just as these two are.
And, also, I think I heard them speak of a second entrance to the
cavern. The one we just saw may not be the main one, through which I
was taken."

"I believe we are on the right track," ventured Mr. Damon, "but we will
either have to go up there after dark, which will be risky, on account
of the narrow trail, or else we will have to find some other path."

"The last would be better," spoke Tom.

"That rod of metal sticking up on top of the cave interested me," said
the scientist. "Did you hear anything of that when you were here
before, Mr. Jenks?"

"No. Probably that is only a lightning rod, or it may be a staff for a
signal flag. But what surprises me is that those men didn't suspect
that we were seeking to discover their secret.  They took us for
ordinary prospectors."

"So much the better," remarked Tom. "We have a chance now of getting
inside that cave. But we will have to go back to camp, and make other
plans. And we must hurry, or it will be dark before we get there."

They hastened their steps, pausing only briefly to eat some of the
lunch they had brought along, and to drink from a spring that bubbled
from the side of the mountain. It was getting dusk when they got back
to their tent. They found nothing disturbed.

"I wonder if we'll see that phantom again to-night?" ventured Tom, as
they were sitting about the campfire a little later.

"Probably not," remarked Mr. Jenks. "I don't believe the ghost will
venture down the dangerous trail after dark, and the gang may think
that the warning given us by the two men on guard at the cave will be
sufficient. But if we don't leave here by to-morrow I think we will
have another visit from the thing in white."

It was about an hour after this when Tom was collecting some wood in a
pile nearer the fire, so as to have it ready to throw on, in case there
was any alarm in the night, that he happened to look up toward the
summit of the mountain. A slight noise, as of loose stones rolling
down, attracted his attention, and, at first, he feared lest another
landslide was beginning, but a moment later he saw what caused it.

There, advancing down the steep and dangerous trail was the figure in
white--the phantom. Instantly a daring plan came into Tom's head.
Dropping the wood softly, he moved back out of the glare of the fire.

"Mr. Jenks!" he called in a whisper.

The diamond man, who was behind the tent, came toward Tom.

"What is it?" he asked. Then, as he saw the ghostly visitor, he added:
"Oh--the phantom again! What's it up to?"

"The same thing," replied Tom, "but it won't do it long, if my plan

"What plan is that, Tom?"

"I'm going to try to capture that--that man--or whatever it is.  Will
you help?"


"Then let's work around behind it, while Mr. Damon and Mr. Parker come
up from in front. We'll solve this part of the mystery, anyhow, if it's

The two other men were soon told of the plan. Meanwhile the thing in
white had advanced slowly, until within a few hundred feet of the camp.
They could see now that it was no shaft of light, but some white body,
shaped like a tall, thin man, draped in a white garment. The long arms
waved to and fro. There was no semblance of a head.

"You and Mr. Parker go right toward it, slowly, Mr. Damon," advised
Tom. "Mr. Jenks and I will make a circle, and get in back. Then, if
it's anything alive we'll have it."

The "ghost" continued to advance. Tom and the diamond man stole off to
one side, their buckskin moccasins making no sound. Mr. Damon and the
scientist went boldly forward.

This movement appeared to disconcert the spirit. It halted, waved the
arms with greater vigor than before, and seemed to indicate to the
adventurers that it was dangerous to advance. But Mr. Damon and Mr.
Parker kept on. They wanted to give Tom and Mr. Jenks time enough to
make the circuit.

Suddenly the stillness of the night was broken by a low whistle. It was
Tom's signal that he and Mr. Jenks were ready.

"Come on! Run!" cried Mr. Damon.

The scientist and the eccentric man leaped forward.

The "ghost" heard the whistle, and heard the spoken words. The thing in
white hesitated a moment, and then raised one arm. There was a flash of
lire, and a loud report.

"He's firing in the air!" cried Tom. "Come on, we have him now!"

Undaunted by the display of firearms, Mr. Damon and Mr. Parker kept on.
They could hear Tom and Mr. Jenks running up in back of the figure. The
latter also heard this, and suddenly turned.  Caught between the two
forces of our friends, the "ghost" was at a loss what to do.

The next instant Tom, who had distanced Mr. Jenks, made a flying tackle
for the figure in white, and caught it around the legs. Very
substantial legs they were, too, Tom felt--the legs of a man.

"Wow!" yelled the "ghost," as he went down in a heap, the revolver
falling from his hand.

"Come on!" cried Tom. "I have him!"

His friends rushed to his aid. There was a confused mass of dark
bodies, arms and legs mingled with something tall and thin, all in
white. Suddenly the moon came from behind a cloud and they could see
what they had captured--for captured the phantom was.

It proved to be a rather small man, who wore upon his shoulders a
framework of wood, over which some white cloth was draped. It had
fallen off him when Tom made that tackle.

"Well," remarked the young inventor, as he sat on the struggling man's
chest. "I guess we've got you."

"I rather guess you have, stranger," was the cool reply.



They were all panting from the exertion of the run up the mountain and
the contest with the phantom--a phantom no longer--though, truth to
tell, the struggle was not nearly so fierce as Tom had expected. He
thought the "ghost" would put up a stiff fight.

"Got any ropes to tie him with?" asked Mr. Damon, who was helping Tom
hold the man down.

"Ropes? You aren't going to tie me up are you, strangers?" asked the

"That's what we are!" exclaimed Mr. Jenks. "We've had trouble enough in
this matter, and if I've got one of the gang, perhaps I can get some of
the others, and have my rights. So tie him up, Tom, and we'll take him
to camp.

"Oh, you needn't go to all that trouble, strangers," went on the man,
calmly. "If one of you will get off my chest, and the other gentleman
ease up on my stomach a bit, I'll walk wherever you want me, and not
make any trouble. I haven't got a gun."

"Bless my gloves! But you're a cool one," commented Mr. Damon, as he
complied with the man's request, and got up from his stomach. "But look
out for him, Tom. He had a gun, for he fired it in the air."

"He hasn't it now," answered the young inventor. "I knocked it from his
hand when I leaped for him."

"That's what you did," assented the man, as he got up, while Tom kept a
tight hold of him, as did Mr. Jenks. "What kind of a grizzly bear hug
do you call that, anyhow, that you gave me?"

"That was a football tackle," explained Tom.

"I allers heard that was a dangerous game!" remarked the former phantom
simply. "Well, now you've got me, what are you going to do with me?"

"Take you where we can have a good look at you," replied Mr. Jenks, as
he kicked aside the wooden framework, and the sheet which had made the
"ghost" appear so tall. "So this is how you worked it; eh?"

"Yep. That was the 'haunt' stranger. I made it myself, and it worked
all right until you folks come along. I rather suspicioned from the
first, when I played the trick over on 'tother side of the mountain,
that you wouldn't be so easy to fool as most prospectors are."

"Oh, so you're the only ghost then?" asked Tom.

"I'm the only one."

By this time they had reached the camp. Tom threw some light logs on
the fire, which blazed up brightly. As the flames illuminated the face
of their captive, Mr. Jenks looked at him, and cried out:

"Why it's Bill Renshaw!"

"That's me," admitted the man who had played the part of the phantom,
"and thunder-turtles! if it ain't Mr. Jenks who was once in the diamond
cave with us. Whatever happened to you? I never heard. The others said
you got tired and went away."

"They took me away--defrauded me of my rights!" declared Mr. Jenks,
bitterly. "But I'll get them back! To think of Bill Renshaw playing the
part of a ghost!"

"They made me do it," went on the man, somewhat dejectedly. "I wanted
to be at work in the cave, but they wouldn't let me."

"Is this man one of the diamond makers?" asked Tom, in great surprise.

"He is--one of the helpers, though I don't believe he knows the secret
of making the gems," explained Mr. Jenks. "He was one of the men in the
cave when I was there before, and he and I struck up quite a
friendship; didn't we, Renshaw?"

"That's what, and there ain't no reason why we can't be friends now;
that is unless you hold a grudge against me for firing at you. But I
only shot in the air, to scare you away. Them's my instructions. I'm
supposed to be on guard, and scare away strangers. I'm tired of the
work, too, for I don't get my share, and those other fellows, in the
cave, get all the money from the diamonds."

Tom Swift uttered an exclamation. A sudden plan had come to him.
Quickly he whispered to Mr. Jenks:

"Make a friend of this man if possible. He evidently is dissatisfied.
Offer him a sum to show us another way into the cave, and we may yet
discover the secret of the diamond makers."

"I will," declared Mr. Jenks, quietly. Then, turning to Renshaw, he

"Bill, come over here. I want to have a talk with you. Perhaps it will
be to our mutual advantage."

He led the former phantom to one side, and for some time conversed
earnestly with him. Mr. Jenks told the story of how he had been
deceived by Folwell and the others who were at the head of the gang of
diamond makers. The rich man related how they had taken his money, and,
after promising to disclose the secret process to him, had broken
faith, and had drugged him, afterward taking him out of the cave.

"I want only my rights, and that for which I paid," concluded Mr.
Jenks. "Now, I gather that these men haven't treated you altogether
fairly, Bill."

"Indeed they haven't. I helped 'em to the best of my ability, and all I
get out of it is to stay out on this lonely side of the mountain, and
play ghost. They owe me money, too, and they won't pay me, either,
though they have lots, for they sold some diamonds lately."

"Then they are still making diamonds?" asked Mr. Jenks, eagerly. "Have
you seen them? Do you know the secret?"

"No, I don't know it, for they won't let me in on it. I'm always sent
out of the cave just before they make the gems. But I know they've made
some lately, and have sold 'em. I want my share."

"Look here!" exclaimed Mr. Jenks, quickly, wishing to strike while the
iron was hot. "I'll make you a proposition. Show us how to get into
that cave, unknown to the diamond makers, and I'll pay you twice what
they agreed to. Is it a bargain?"

Bill Renshaw considered a moment. Then he thrust out his hand, clasped
that of Mr. Jenks, and exclaimed:

"It is. I'll take you into the cave by an entrance that's seldom used.
There are four ways to get in. The one where the two men drove you back
is the rear one. The front one is on the other side of the mountain,
but it's so well concealed that you'd never find it. But I can take you
to one where you can get in, and those fellows will never know it. And,
what's more, I'll help you if it comes to a fight!"

"Good!" exclaimed Mr. Jenks. "I think we'll discover the secret of the
diamond makers this time," and he went to tell the others of the
success of his talk. Bill Renshaw had been converted from an enemy into
a friend, and the former phantom was now ready to lead Tom and the
others into the secret cave.

"We'll start in the morning," decided Mr. Jenks, who, after many
disappointments, at last saw success ahead of him.



Tom Swift was up at break of day, and the others were not far behind

"Now for the secret cave!" cried the young inventor as he gazed up the
mountain, in the interior of which the mysterious band of men were
making the diamonds.

"Have you made any plans, Bill?" asked Mr. Jenks of the former phantom,
who had cast his lot in with the adventurers. "What will be the best
course for us to follow?"

"You just leave it to me, Mr. Jenks," was the answer. "I'll get you
into the cave, and those fellows, who, I believe, are trying to do me
out of my rights, as they did you out of yours, will never know a thing
about it."

"Bless my finger-nails!" cried Mr. Damon. "That will be great!  We can
get in the cave, and watch them make the diamonds at our leisure."

"They don't make them every day," explained Renshaw. "It seems they
have to wait for certain occasions. Mostly they make the diamonds when
there's a big storm."

"A big storm" asked the scientist with a sudden show of interest. "Do
you mean one of those electrical storms, such as we had the other

"That's it, Mr. Parker, though why they wait until there's a storm is
more than I can tell."

"Perhaps they know that on such occasions no one will venture up the
mountain," spoke Mr. Damon.

"No, it isn't that," declared the scientist. "I think I am on the track
of a great scientific discovery, and I will soon be able to make
observations that will confirm it."

"Well, I'm going to make an observation right now," said Tom, with a
laugh. "I'm going to see what there is for breakfast."

"And that reminds me," came from Mr. Jenks, "shall we move our camp,
Bill, and take the tent with us to the cave?"

"I hardly think so," was the answer. "I think the best plan would be to
conceal the tent somewhere around here, in case you might need it
again. You can also store what food you have left."

"But, bless my appetite, we don't want to starve in that diamond cave!"
objected Mr. Damon.

"I'll see that you don't," declared Bill Renshaw. "I'll take you in
there, unbeknownst to those fellows, and I'll provide you with plenty
of food and water. You see the cave is so big that there are some parts
they never visit."

"And we can stay in one of those parts, and eat?" asked Tom.

"Sure," answered Bill.

"And watch the diamond makers at work?" asked Mr. Jenks.

"That's it," replied the former phantom.

"Then the sooner we get started the better," remarked Mr. Damon. Mr.
Parker said nothing. He appeared to be thinking deeply, and was tapping
at some rocks with his little hammer.

The advice of Bill Renshaw was followed, and the tent, and what food
remained, was concealed in the bushes, with rocks piled over to keep
away prowling animals. Then they started for the secret cave.

The man who played the part of a ghost picked up the framework and
white cloth that had formed his disguise.

"I'll still have to use this," he explained, "for I don't want those
fellows to know that I'm helping you. I'll continue to play the spirit
of the mountain, but there won't be much need of it. I don't think any
more people will come prospecting out here."

"Have you heard of the arrival of Farley Munson?" asked Tom, as he
related the facts about the stowaway.

"He hadn't arrived up to a day or so ago," answered Bill. "I guess he's
still traveling. Farley is one of the heads of the gang," he added,
"and a dangerous man."

As Bill led the way toward the cave, taking a route that the
adventurers had never suspected led to it, he explained that the cavern
was a large one, capable of holding an army.

"But there's only a small part of it used by the diamond makers," he
added. "They work in a small recess, near the summit of the mountain.
The little cave, where I'm going to take you, opens off from it by a
long passage. And, except that you'll be pretty much in the dark,
you'll be quite comfortable. There are tables, chairs, and some bunks
in the place. I can get you some lights, and plenty of food."

"But, if you are seen taking away food, won't the others suspect
something?" asked Tom.

"I do pretty much as I please," said Bill. "I go and come when I like.
All I'm supposed to do is to watch my two sides of the mountain, play
the ghost, and give warning when any one is coming. Sometimes I leave
black and white messages, like the one I put on your tent. Those
fellows fix 'em up for me. I've told 'em about you, though I didn't
know who you were, and they think you have gone, for the two men on
guard at the rear entrance so reported. Sometimes I stay out on the
mountain for a couple of days at a time, when the weather's good, and
don't go back to the cave. Those times I take food with me, and so if
they see me making off with some supplies they'll think I'm going to
camp out."

"It doesn't look as though we'd ever get into a cave near the top of
the mountain, going this way," said Tom, as they marched along. "We're
going down, instead of up."

"That's the secret of this trail," explained Bill. "We go down in a
sort of valley, and then go up a pretty stiff place, and then we're on
a direct trail to the entrance I told you about.  It's a steep road to
climb, but I guess we can manage it."

And a hard climb the adventurers did find it. The road was almost as
bad as the one along the edge of the chasm, but they managed to
negotiate it, and finally found themselves on a fairly good trail.

"We'll soon be there," Bill assured them. "After you get in the little
cave, where I'm going to hide you, I'll have to leave you for a spell,
until I get my ghost rigging fixed up again. But I'll see that you have
plenty of food and drink."

A little later their guide came to a sudden halt, and peered around

"What's the matter?" asked Tom.

"I was just looking to see if any of the men were about," he answered.
"But I guess not--it looks all right. The entrance is right here."

They were on a side of the mountain, near the summit. Below stretched a
magnificent scene. A great valley lay at their feet, and they could
look off to many distant peaks. The main trail to Leadville, and the
one to the settlement of Indian Ridge, was in sight.

Suddenly Tom, who had been using a small but powerful telescope,
uttered an exclamation, and focussed the instrument on a speck that
seemed moving along on the trail below.

"A man--coming up the mountain," cried Tom. "And--it can't be--yet it
is--it's Farley Munson--the stowaway!" he cried. "He's coming here!"

"Let me look!" begged Mr. Jenks, taking the glass from Tom. An instant
later the diamond man exclaimed: "Yes, it's Munson!"

"Then in here with you--quick!" cried Renshaw. "He can't see us yet,
and we'll be out of sight in another minute."

The former spirit pulled aside some thick bushes, and pointed to a hole
which was disclosed.

"The entrance to the secret cave," he announced. "Slip in all of you."

Tom, after another glance at the man toiling his way up the mountain,
entered the cavern. He was followed by the others. Bill was the last to
enter, and he replaced the bushes over the entrance.

"At last!" exclaimed Mr. Jenks, as he gazed up at the roof of the
dimly-lighted vault in which they found themselves.

"Yes, we're in the diamond makers' secret cave," added Tom.  "Now to
catch them at work!"

"Come on," advised Bill, in a low tone, "We're not safe yet," and he
produced a lantern from some hidden recess, lighted the wick, and led
the way. As the others followed they were aware of a subdued noise in
the great cavern.



"What's that noise?" asked Tom, as their guide flashed the lantern to
show them the way.

"That's the men getting ready to make diamonds, I guess," was the
answer. "You see it takes quite a while to get the stuff ready. I don't
know what they use--they never tell me any of their secrets."

"Oh, I know the ingredients well enough," said Mr. Jenks, "but I don't
know the secret of how they apply the terrific heat and pressure
necessary to fuse the materials into diamonds."

"Well, you'll soon know," declared Bill Renshaw. "Of course it isn't
always successful. I've known 'em to try half a dozen times before they
got any diamonds big enough to satisfy 'em. They gave me some of the
small ones when I asked for my wages.

"How did you come to get in with these men?" asked Tom, curious to
understand how a person seemingly as honest as Renshaw appeared to be
had cast his lot in with the men who had broken faith with Mr. Jenks.

"Oh, I've lived around these parts all my life," was the answer. "I
knew of this cave before these diamond fellers came to it. In fact, I
showed it to 'em. It was several years ago that a party of men who were
prospecting around here came to me and asked if I knew of a small cave
near the top of a high mountain, where lightning storms were frequent.
I told them about Phantom Mountain, as it was called then, and also of
this cave. If there's any place where they have worse lightning storms
than here, I'd like to know it. They scare me, sometimes, like the
night when that landslide happened, and I'm sort of used to 'em.

"Well, I took these men to the cave, and they hired me as a sort of
lookout. Then they began their work, and at first I didn't know what
they were up to, but finally I caught on. Then Mr. Jenks came, and
disappeared mysteriously, though then I didn't know that they had
played a trick on him. I was outside most of the time, pretending I was
the ghost. So that's how I came to get in with 'em, and I wish I was

"You soon will be, I think," declared Mr. Jenks. "But won't our talking
be heard by the men?"

"No danger. There is a thick wall between this part of the cave, and
the part where they live and work. I'll soon have you well hid, and
then you wait until I come back."

"What about Munson?" asked Tom. "He is evidently on his way here to
tell his confederates about us."

"He won't know what has happened to us," said Mr. Jenks, "and he won't
see anything of us. I guess we're safe enough."

Through the dark passage they followed Bill Renshaw until he came to a
halt in a place that suddenly widened and broadened into a good-sized

"Here's your stopping place," said the former ghost. "Now if you follow
that passage, off to the left," and he pointed to it, "you'll come to
the larger part of the cave where the diamond makers are. But go
cautiously, and don't make any noise. I won't be responsible for what

"We'll take all the risk," interrupted Tom.

"All right. Now there's a couple of lanterns around here. I'll light
them, and leave you for a while until I can get some grub.  I'll be
back as soon as I can."

He glided away, after lighting two lanterns, by the gleams of which the
adventurers could see that they were in a vaulted cavern that had
evidently been fitted up as a living apartment.  The sides, roof and
floor were of stone. It was clean, and the air was fresh. There were
some chairs, a table, and several cots, with pieces of bagging for
bedding, though it was warm in the place.

"I guess we can stay here until we discover the secret," spoke Tom.

"Bless my watch! We can if we have something to eat," came from Mr.
Damon, with something like a sigh. "I'm hungry!"

"And I want to make some observations," said Mr. Parker. "From what I
have seen of this mountain, I would not be surprised if this cave was
to be suddenly destroyed by a landslide or a lightning bolt. I will
make some further investigations."

"Well, if it's going to cause you to make such gloomy prophecies as
that, I'd just as soon you wouldn't look any further," spoke Tom, in a
low voice. But Mr. Parker, taking one of the lanterns, set about
examining the rock of which the cave consisted.

In a short time Bill Renshaw returned with enough food to last for two
days. He said he was going out on the mountain once more to act the
part of a lookout, and would visit the adventurers again the next day.

"In the meanwhile you can do just as you please," he said.  "Nobody is
likely to disturb you here, and you can sneak up and take a look at the
men in the other cave whenever you're ready.  Only be careful--that's
all I've got to say. They're desperate men."

It was not very pleasant, eating in the gloomy cavern, but they made
the best of it. They cooked on a small oil-stove they found in the
place, and after some hot coffee they felt much better.

"Well," remarked Tom, after a while, "shall we take a chance, and go
look at the men at work?"

"I think so," answered Mr. Jenks. "The sooner we discover this mystery,
the better. Then we can go back home."

"And recover my airship," added Tom, who was a bit uneasy regarding the
safety of the Red Cloud.

"Then, bless my finger-rings! let's go and see if we can find the big
cave your friend the ghost told us of," suggested Mr. Damon.

Cautiously they made their way along the passage Bill had pointed out.
As they went forward the subdued noise became louder, and finally they
could feel the vibration of machinery.

"This is the place," whispered Mr. Jenks. "That sound we hear is one of
the mixing machines, for grinding the materials--carbon and the other
substances--which go to make up the diamonds. I remember hearing that
when I was in the cave before."

"Then we must be near the place," observed Tom.

"Yes, but I didn't have much chance to look around when I was here
before. They wouldn't let me. I never even knew of the small cave Bill
took us to."

"Well, if we're close to it, we'd better go cautiously, and not talk
any more than we're obliged to," suggested Mr. Parker, and they agreed
that this was good advice.

They walked on softly. Suddenly Tom, who was in the lead, saw a gleam
of light.

"We're here," he whispered. "I'll put out our lantern, now," which he
did. Then, stealing forward he and the others beheld a curious sight.
The tunnel they were in ended at a small hole which opened into a large
cavern, and, fortunately, this opening was concealed from the view of
those in the main place.

"The diamond makers!" whispered Tom, hoarsely, pointing to several men
grouped about a number of strange machines.

"Yes--the very place where I was," answered Mr. Jenks, "and there is
the apparatus--the steel box--from which the diamonds are taken--now to
see how they make them."

Fascinated, the adventurers looked into the cave. The men there were
unaware of the presence of our friends, and were busily engaged. Some
attended to the grinding machine, the roar and clatter of which made it
possible for Tom and the others to talk and move about without being
overheard. Into this machine certain ingredients were put, and they
were then pulverized, and taken out in powdery form.

The power to run the mixing machine was a gasoline motor, which
chug-chugged away in one corner of the cave.

As the powder was taken out, other men fashioned it into small balls,
which were put on pan, and into a sort of oven, that was heated by a
gasoline stove.

"Is that how they make the diamonds?" asked Mr. Damon.

"That is evidently the first step," said Mr. Jenks. "Those balls of
powdered chemicals are partly baked, and then they are put into the
steel box. In some way terrific heat and pressure are applied, and the
diamonds are made. But how the heat and pressure are obtained is what
we have yet to learn."

He paused to watch the men at work. They were all busy, some attending
to the machines, and others coming and going in and out of the cave. In
one part a man was apparently getting ready a meal.

Suddenly there rushed into the cave a man who seemed much excited.

"Are you nearly ready with that stuff?" he cried. "There's a good storm
gathering on the mountain!"

"Yes, we'll be ready in half an hour," answered one of the men at the
mixing machine.

"Good. It will be flashing lightning bolts then, and we can see what
luck we have. The last batch was a failure." The man hurried out again.
Mr. Parker touched Tom and Mr. Jenks on their shoulders.

"What is it?" asked Tom.

"I know the secret of making the diamonds," said the scientist.

"What?" cried Mr. Jenks.

"It is by the awful power of the lightning bolts!" whispered Mr.
Parker. "Everything is explained now--the reason why they make diamonds
in this lonely place, near the top of the mountain.  They need a place
where the lightning is powerful. I can understand it now--I suspected
it before. They make diamonds by lightning!"

"Are you sure?" cried Mr. Jenks.


"I agree with you," said Tom Swift. "I was just getting on that track
myself, when I saw the electric wires running to the steel box. That
explains the upright rod on the top of the mountain.  The man says a
storm is coming--very well; we'll stay here and watch them make

As he spoke there came the mutter of thunder, and the mountain vibrated
slightly. The men in the cave redoubled their activity.  Tom and his
friends felt that the secret process they had so long sought was about
to be demonstrated before their eyes.



Eagerly the adventurers looked through the opening at the end of the
passage into the larger cave. The men opened the small oven in which
the balls of white chemicals and carbon mixed, had been baked, and a
pile of things, that looked like irregularly-shaped marbles, were
placed in the steel box.

This box, which was about the size of a trunk, was of massive metal. It
was placed in a recess in the solid rock, and all about were layers of
asbestos and other substances that were nonconductors of heat.

"That box becomes red hot," exclaimed Mr. Jenks, in a whisper.  "When
things are in readiness, that lever is pulled and the diamonds are
made. I pulled it once, but I did not then know the process involved. I
supposed that the lightning had nothing to do with making the diamonds."

"It has--a most important part," said Mr. Parker. The hidden
adventurers could talk in perfect safety now, for the men in the large
cave were too excited to pay much attention to them. The muttering of
the thunder grew louder, and at times a particularly loud crash told
that a bolt had struck somewhere in the vicinity of the cave.

"But, bless my watch-charm!" exclaimed Mr. Damon, "I didn't know
lightning made diamonds."

"It does not--always," went on the scientist. "But great heat and
pressure are necessary to create the gems. In nature this was probably
obtained by prehistoric volcanic fires, and by the terrific pressure of
immense rocks. It is possible to make diamonds in the laboratory of the
chemist, but they are so minute as to be practically valueless.

"However, these men seem to have hit upon a new plan. They utilize the
terrific heat of lightning, and the pressure which is instantaneously
obtained when the bolt strikes. I am anxious to see how it is done.
Look, I think they are getting ready to make the gems."

Indeed there seemed to be an air of expectancy among the diamond
makers. The mixing machine had now been stopped, and, as it was more
quiet in the cave, our friends, in their hiding-place, had to speak in
mere whispers. All the men were now gathered about the great steel box.

This receptacle had been closed by a solid metal door, which was
screwed and clamped tight. Then one of the men examined a number of
heavily insulated electric wires that extended from the box off into
the darkness where Tom and his companions could not discern them.

"That's Folwell--the man I befriended, and who got me into this game,"
whispered Mr. Jenks. "He was also one of the first to turn against me.
I think he's one of the leaders."

Folwell came back, after having gone into a dark part of the cave. He
went over to an electrical switch on one of the stone walls.

"It's almost time," Tom heard him say to his confederates. "The storm
is coming up rapidly."

"Will it be severe enough?" asked one of the helpers. "We had all our
work for nothing last time. The flashes weren't heavy enough."

"These will be," asserted Folwell. "The indicator shows nearly a
million volts now, and it's increasing."

"A million volts!" exclaimed Tom. "I hope it doesn't strike anywhere
around here."

"Oh, it will probably be harmlessly conducted down on the heavy wires,"
said Mr. Parker. "We are in no danger, at present, though ultimately I
expect to see the whole mountain shattered by a lightning bolt."

"Cheerful prospect," murmured Tom.

There was a terrific crash outside. The rocky floor of the cave

"Here she comes!" cried Folwell. "Get back, everybody! I'm going to
throw over the switch now!"

The men retreated well away from the steel box. Folwell threw over the
lever--the same one Mr. Jenks remembered pulling. Then the man ran to
the electric switch on the wall, and snapped that into place,
establishing a connection.

There was a moment's pause, as Folwell ran to join the others in their
place of safety. Then from without there came a most nerve-racking and
terrifying crash. It seemed as if the very mountain would be rent into

Watching with eager eyes, the adventurers saw sparks flash from the
steel box. Instantly it became red hot, and then glowed white and
incandescent. It was almost at the melting point.

Then came comparative quiet, as the echoes of the thunder died away
amid the mountain peaks.

"I guess that did the trick!" cried Folwell. "It was a terrific crash
all right!"

He and the others ran forward. The steel box was now a cherry red, for
it was cooling. Folwell threw back the lever, and another man
disconnected the switch. There was a period of waiting until the box
was cool enough to open. Then the heavy door was swung back.

With a long iron rod Folwell drew something from the retort. It was the
tray which had held the white balls. But they were white no longer, for
they had been turned into diamonds. From their hiding-place Tom and the
others could see the flashing gems, for, in spite of the fact that the
diamonds were uncut, some of them sparkled most brilliantly, due to the
peculiar manner in which they were made.

"We have the secret of the diamonds!" whispered Mr. Jenks.  "There must
be a quart of the gems there!"

The men gathered about Folwell, uttering exclamations of delight. The
diamonds were too hot to handle yet.

"That's going some!" exclaimed the chief of the diamond makers.  "We
have a small fortune here."

The was a sudden commotion at one end of the cave. A man rushed in. At
the sight of him Tom stared and uttered an exclamation.

"Munson--the stowaway!" he whispered.

"Hello!" cried Folwell, as he saw his confederate. "I thought you were
East, keeping Jenks away from here."

"He got the best of me!" cried Munson, "he and that Tom Swift!  I
stowed away on their airship, but they found me out by a wireless
message, and marooned me in the woods. I've been trying to get here
ever since! Didn't you get my messages of warning?"

"No--what warnings?" cried Folwell.

"About Jenks, Tom Swift and the others. They're here--they must be on
Phantom Mountain now. In fact, I shouldn't be surprised if they were in
this cave. I traced them to their camp, but they're gone. They may be
among us now--in some of the secret recesses!"

For an instant Folwell stared at the bearer of these tidings.  Then he
cried out:

"Scatter men, and find these fellows! We must get them before they
discover our secret!"

"It's too late--we know it!" exulted Tom Swift. Then he whispered to
the others to hurry to the part of the cave where Bill Renshaw had
first hidden them.



"Do you think there is any danger of them finding us?" asked Mr. Damon,
as he hurried along beside Tom.

"I'm afraid so," was the answer. "I've been worried ever since we saw
Munson heading this way. But we couldn't do any differently."

"Perhaps Bill Renshaw may be able to conceal us," suggested Mr. Jenks.
"Very likely he knows that Munson is on hand. Perhaps we will be safe
for a while. I want to make a few more observations as to how they
manufacture the diamonds, and then, with what I already know, I'll have
the secret."

"And I'd like to make some scientific tests of the sides and bottom
rocks of the cave," spoke Mr. Parker. "I think it will bear out my
theory that the mountain will soon be destroyed."

"Well, you were right about Earthquake Island, and you may be right
about this mountain," said Tom, "but if it is going to be annihilated I
hope we get far enough away from it."

"We can keep our presence here a secret for a few more days, I think
that will be long enough," proceeded Mr. Jenks. "Then we will leave."

"And, in the meanwhile, they'll be searching for us," objected Mr.
Damon. "I wish that ghost-chap would come back and tell us what to do.
Bless my liver-pin, but we are going to be in considerable danger, I'm
afraid! Those men may capture us, and decide to make diamond dust from

"Come on--hurry to the little cave," urged Tom. "Then we'll get ready
to defend ourselves."

"The main cave is a large one," said Mr. Jenks, "and there are many
hiding places in it. In fact, it is so large that it will take those
fellows several days to complete a circuit of it. By that time Bill
Renshaw may come back, and take us to some place in which they have
already searched for us. Then we'll be comparatively safe."

This thought was some consolation to them, as they made their way
through the dark passage, dimly illuminated by the lantern they had
rekindled, to the place where Bill had hidden them. They found things
as they had left them, and proceeded to get a meal, though Tom said it
would be best not to cook anything, or even to make coffee, for fear
the odors would enable the searchers to trail them.

So they ate cold food, glad to get that. Silently they sat about the
dimly-lighted cavern, and discussed the situation. True they might even
now retreat, going out of the entrance Bill had showed them, and so
escape. But Mr. Jenks felt that his mission was not completed yet, and
they all agreed to stay with him.

"For there are several points about making diamonds that are not quite
clear to me," he said. "I need to know how that steel box is
constructed, how the electrical switches are arranged, what kind of
lightning rods they use, and how they regulate the pressure. The other
things, and how to mix the ingredients, I already know."

"Then we'll do our best to help you," promised Tom. "But now I think we
had better see what sort of a defense we can put up. We have our guns
and revolvers, and with these chairs and tables we can build a sort of
barricade behind which we can take refuge if those fellows do discover
our hiding place."

This was conceded to be a good idea, and soon a rude sort of fort was
made, behind which the adventurers could take their stand and fight, if
necessary, though they hoped this would not come to pass.

They remained quietly in the cave the remainder of that day, and, when
it was night, as they could tell by their timepieces--there was no
daylight--they divided the hours into watches, taking turns standing

Morning, at least in point of time, came without any disturbance, and
they made a cold breakfast. They hoped that Bill Renshaw would come,
but he did not appear.

After sitting in the dark cave until afternoon, Tom said:

"I think we might as well go and take another observation of the big
cave. We can tell what the men are doing, then, for they don't seem to
have been near us. Maybe they have given up the search for us, and we
can see them at work, and Mr. Jenks can gain what further knowledge he

"That will be a good plan," agreed the diamond man. "It's maddening to
sit here, doing nothing."

"And it will be comparatively safe to go from here to our former post
of observation," added Tom, "for there doesn't seem to be any opening
along the tunnel, into the larger cave, except the place where we were."

Accordingly they started off. Cautiously they looked through the
opening into the apartment where they had seen the diamonds made.

"There's not a soul here!" exclaimed Tom, in a whisper. The others
looked. The place was deserted--the machinery silent. Mr. Jenks peered
in for a moment, and then exclaimed:

"I'm going in! Now's my chance to find out all that I wish to know! It
may never come again, and then we can soon leave Phantom Mountain!"

It was a daring plan, but it seemed to be the best one to follow. They
were all tired of inactivity. Mr. Jenks managed to get through the
opening, and dropped into the big cave. The others followed. Mr. Jenks
hurried over to the steel box, and began an examination of it. Tom
Swift was looking at the electrical switch. He saw how it was
constructed. Mr. Damon and Mr. Parker were peering interestedly about.

Suddenly the sound of voices was heard, and the echo of footsteps. Mr.
Jenks started.

"They're coming back!" he whispered hoarsely. "Run!"

They all turned and sped toward their hiding place. But they were too
late. An instant later Folwell, Munson and the other diamond makers
confronted them. Our friends made a bold rush, but were caught before
they could go ten feet.

"We have them!" cried Munson. "They walked right into our hands!"

It was true. Tom Swift and the others were the prisoners of the diamond



"Well," remarked Tom Swift, in mournful tones, "this looks as if we
were up against it; doesn't it?"

"Bless my umbrella, it certainly does," agreed Mr. Damon.

"And it's all my fault," said Mr. Jenks. "I shouldn't have gone into
the big cave. I might have known those men would come back any time."

The above conversation took place as our friends lay securely bound in
a small cave, or recess, opening from the larger cavern, where, about
an hour before, they had been captured and made prisoners by the
diamond makers. Despite their struggles they had been overpowered and
bound, being carried to the cave, where they were laid in a row on some
old bags.

"It certainly is a most unpleasant situation, to say the least,"
observed Mr. Parker.

"And all my fault," repeated Mr. Jenks.

"Oh, no it isn't," declared Tom Swift, quickly. "We were just as ready
to follow you into that cave as you were to go. No one could tell that
the men would return so soon. It's nobody's fault. It's just our bad

From where he lay, tied hand and foot, the young inventor could look
out into the cave where he and the others had been caught.  The diamond
makers were busily engaged, apparently in getting ready to manufacture
another batch of the precious stones. They paid little attention to
their captives, save to warn them, when they had first been taken into
the little cave, that it was useless to try to escape.

"They needn't have told us that," observed Tom, as he and the others
were talking over their situation in low voices. "I don't believe any
one could loosen these ropes."

"They certainly are pretty tight," agreed Mr. Damon. "I've been tugging
and straining at mine for the last half hour, and all I've succeeded in
doing is to make the cords cut into my flesh."

"Better give it up," advised Mr. Jenks.

"We'll just have to wait."

"For what?" the scientist wanted to know.

"To see what they'll do with us. They can't keep us here forever.
They'll have to let us go some time." Following their capture, Folwell
and Munson, the latter the stowaway of the airship, had been in earnest
conversation regarding our friends, but what conclusion they had
reached the adventurers could only guess.

"And we didn't have time to examine the diamond-making machinery close
enough so that we could duplicate it if necessary," complained Tom, a
little later.

"No," agreed Mr. Jenks. "There are certain things about it that are not
clear to me. Well, I don't believe I'll have another chance to inspect
it. They'll take good care of that, though they seem to be getting
ready to make more diamonds."

"Perhaps they're going to manufacture a big batch, and then leave this
place," suggested Mr. Damon. "They will probably go to some other
secret cave, and leave us here."

"I hope they untie us before they leave, and give us something to eat,"
remarked the young inventor.

For two hours longer the captives lay there, in most uncomfortable
positions. Then Folwell and Munson, leaving the group of diamond makers
who were grouped about the machinery, approached the captives.

"Well," remarked Munson, "we got ahead of you after all; didn't we. You
thought you had our secret, but it will be a long while before you ever
make diamonds."

"What are you going to do with us?" asked Tom.

"Never mind. You came where you had no right to, and you must take the

"We did have a right to come here!" exclaimed Mr. Jenks. "I am entitled
to know how the diamonds are made. I paid for the information, and you
tricked me. If ever it's possible I'll have the whole gang arrested for

"You'll never get the chance!" declared Folwell. "You were given some
diamonds for the money you invested, and that makes us square."

"No, it doesn't!" declared Mr. Jenks. "I invested the money to learn
how to make diamonds, and you know it! You tricked me, and I had a
right to try to discover your secret! I nearly have it, too, and I'll
get it completely before I'm done with you!"

"No, you won't!" boasted Folwell. "But we didn't come here to tell you
that. We came to give you something to eat. We're not savages and we'll
treat you as well as we can in spite of the fact that you are
trespassers. We're going to give you some grub, but I warn you that any
attempt to escape will mean that some of you will get hurt."

He signalled to some of his confederates. These men unbound the
captives' arms, and stood over them while they ate some coarse food
that was brought into the small cave. They were given coffee to drink,
and then, when the simple meal was over, they were securely bound
again, and left to themselves, while the diamond makers went back to
their machinery.

It was evident that they were going to attempt a big operation, for an
unusually large quantity of the white stuff was prepared.  The
prisoners watched them idly. They could see some but not all of the
operations. In this way several hours passed.

Gloom possessed the hearts of Tom and his friends. Not only had their
expedition been almost a failure so far, but the young inventor was
worried lest the gang might discover and wreck his airship. This would
prove a serious loss. Lying there in the semi-darkness the lad imagined
all sorts of unpleasant happenings.

At times he dozed off, as did the others. They had become somewhat used
to the pain caused by the bonds, for their nerves were numb from the
strain and pressure.

Once, as he was lightly sleeping, Tom was awakened by hearing loud
voices in the main cave. He looked out, rolling over slightly to get a
better view. He saw the man who, once before had run in to give news of
an approaching electrical storm.

"Are you fellows all ready?" asked this same man again.

"Yes. Is there another storm coming?"

"Yes, and it's going to be a corker!" was the reply. "It's one of the
worst I've ever seen. It's sweeping right up the valley.  It'll be here
in an hour."

"That's good. We need a big flash to make all the material we have
prepared into diamonds. It's the biggest batch we ever tried. I hope it
succeeds, for we're going to leave--" The rest was in so low a tone
that Tom could not catch it.

The storm messenger departed. Folwell and Munson busied themselves
about the machinery. Tom dozed off again, dimly wondering what had
become of Bill Renshaw, and whether the former ghost knew of their
plight. The others were asleep, as the young inventor saw by the dim
light of a lantern in the cave. Then, he too, shut his eyes.

Tom was suddenly awakened by feeling some one's hands moving about his
clothing. At first he thought it was one of the diamond-making gang,
who had sneaked in to rob him. "Here! What are you up to?" exclaimed

"Quiet!" cautioned a voice. "Are you all here?"

"All of us--yes. But who are you?"

"Easy--keep quiet, Tom Swift! I'm Bill Renshaw! I've been searching all
over for you, since I got back to your cave and found it empty. Now I'm
going to free you. I got in here by a secret entrance. Wait, I'll cut
your ropes." There was a slight sound, and an instant later Tom was
freed from his bonds.



The young inventor could scarcely believe the good luck that had so
unexpectedly come to him and his companions. No sooner was Tom able to
move freely about than Bill Renshaw performed the same service for Mr.
Jenks and the others, cautioning them to be quiet as he awakened them,
and cut the ropes.

"Bless my circulation!" exclaimed Mr. Damon, in a hoarse whisper. "How
did you ever get here. I'd given ourselves up for lost."

"Oh, I came in off the mountain, as there's a big storm due," explained
the man. "There was no need of me playing the haunt in daytime, anyhow.
I went to the cave, found you and your things gone, and I surmised that
you might have walked into some trap."

"We did," admitted Mr. Jenks, grimly.

"Well, I hunted around until I found you," went on Bill. "This mountain
is honeycombed with caves, all opening from the large one, I know them
better than these fellows do, so I could explore freely, and keep out
of their sight. They didn't know that there was a second entrance to
this place, but I did, and I made for it, when I couldn't find you in
some of the other caves where I looked. And, sure enough, here you

"Well, we can't thank you enough," said Mr. Parker. "But you say there
is a big storm coming?"

"One of the biggest that's been around these parts in some time,"
replied Bill.

"Then perhaps the mountain will be destroyed," went on the scientist,
as calmly as if he had remarked that it might rain.

"I hope nothing like that happens until we get away," spoke Mr. Damon,

"What had we better do?" inquired Tom.

"Get away, unless you want to discover some more of their secrets,"
advised Bill. "Those fellows are planning something, but I can't find
out what it is. They are suspicious of me, I think. But they are up to
something, and I believe, it would be best for you to leave while you
have the chance. It may not be healthy to stay. That's why I did my
best to untie you."

"We appreciate what you have done," declared Mr. Jenks, "but I want my
rights. I must learn a few more facts about how to make diamonds from
lightning flashes, and then I will have the same secret they cheated me
out of. I think if we wait a while we may be able to see the parts of
the process that are not quite clear to us. What do you say, Tom Swift?"

"Well, I would like to learn the secret," replied the lad, "and if Bill
thinks it's safe to stay here a while longer--"

"Oh, I guess it will be safe enough," was the reply. "Those fellows
won't bother about you now that they are about to make some more
diamonds. Besides, they think you're all tied up. Yes, you can stay
here and watch, I reckon. I've got a couple of guns, and--"

"Then we'll stay," decided Tom. "We can put up a better fight now."

Silently, in their prison, but which they could now leave whenever they
pleased, the adventurers watched the diamond makers once more. The same
process they had witnessed before was gone through with. The white
balls were put inside the steel box and sealed up. Then they waited for
the storm to reach its height.

That this would not be long was evidenced by the mutterings of thunder
which every moment grew louder. The outburst of electrical fury was
likely to take place momentarily, and that it would be unusually severe
was shown by the precautions taken by the diamond makers. They attached
a number of extra wires, and brought out some insulated, hard rubber
platforms, on which they themselves stood. Tom and Mr. Jenks were much
interested in watching this detail of the work, and sought to learn how
each part of the process was done.

"I almost think we can make diamonds, Tom, when we get back to
civilization," whispered Mr. Jenks.

"I hope we can," answered Tom, "and we can't get back any too soon to
suit me. I want to be in my airship again."

"I don't blame you. But look, they are getting ready to adjust the

The adventurers ceased their whispered talk, and eagerly watched the
diamond makers. Folwell and Munson were hurrying to and fro in the big
cave, attending to the adjustments of the machinery.

"On your insulated plates--all of you," Folwell gave the order.  "This
is going to be a terrific storm. The gage shows twice the power we have
ever used, and it's creeping up every minute! We'll have more diamonds
than ever had before!"

"Yes, if the mountain isn't destroyed," added Mr. Parker, in a low
voice. "I predict that it will be split from top to bottom!"

"Comforting," thought Tom, grimly.

"I guess we're all ready," said Folwell, in a low tone to Munson. "We'd
better get insulated ourselves. I'm going to throw the switch."

He did so. A moment later the man who had before given warning of the
storm came dashing in. He was very much excited.

"It's awful!" he cried. "The lightning is striking all over!  Big rocks
are being split like logs of wood!"

"Well, it can't do any damage in here," said Munson. "We are well
protected. Get on one of the plates," and he motioned to one of the
hard-rubber platforms that was not occupied. The roar and rumble of the
storm outside had given place to short terrific crashes. In their small
cave the adventurers could feel the solid ground shake.

A bluish light began dancing about the electrical wires. There was a
smell of sulphur in the air. Crash after crash resounded outside. A
flash of flame lit up the whole interior of the cave.  It came from the
copper switch.

"Something's wrong with the insulation!" cried Munson.

"Don't go near it!" yelled Folwell. "If you value your life, stand

Hardly had he spoken than inside the cavern there sounded a report like
that of a small cannon. A big ball of fire danced about the middle of
the cave and then leaped on top of the steel box.

"This is a fearful storm," cried Munson.

The adventurers in the cave did not know what to say or do.  They were
in deadly peril.

Suddenly there came a crash louder than any that had preceded it. The
whole side of the cave where the switches were was a mass of bluish
flame. Then came a ripping, tearing sound, and a tangle of wires and
copper connections were thrown to the floor. At the same time the steel
box, containing the materials from which diamonds were made, turned
blue, and flames shot from it.

"It's all up with us!" cried Munson. "Run for it, everybody!  The wires
are down, and this place will be an electric furnace in another minute!"

He leaped toward the exit from the cave.

"What about those fellows?" asked Folwell, indicating the place where
Tom and the others had been tied.

"They'll have to do the best they can! It's every man for himself,
now!" yelled Munson. There was a wild scramble from the cavern.

"Come on!" cried Tom. "We must escape! It's our only chance!"

He leaped into the big cave, followed by the others. Already long
tongues of electrical fire were shooting out from the walls and roof as
Tom Swift and his companions, evading them as best they could, sought
safety in flight.



"Can't we get some of the diamonds?" cried Mr. Damon, as he raced along
behind Tom. "Now's our chance. Those fellows have all gone!" The odd
man made a grab for something as he ran.

"It's as much as our lives are worth," declared the young inventor. "We
dare not stop! Come on!"

"I'd like to investigate some of the machinery," spoke Mr. Jenks, "but
I wouldn't stop, even for that."

"The storm is too dangerous," called Bill Renshaw. "I can show you a
shorter way out than the one those fellows have taken.  Follow me."

"No way can be too short," said Mr. Parker, solemnly. "This mountain
will go to pieces shortly, I think!"

Tom shuddered. He remembered how narrow had been their escape when
Earthquake Island sank into the sea. And that some terrific upheaval
was now imminent might be judged from the awful reports that sounded
more plainly as the adventurers raced toward the opening of the cave.
It was like the bombardment of some doomed city.

Mr. Jenks and Tom cast one longing look behind at the complicated and
expensive machinery that had been installed in the cave by the diamond
makers. They had abandoned it, and in it lay the secret of making
precious gems. But there was no time to stop now, and investigate.

"This way," urged Bill Renshaw. "We'll soon be out."

"But won't it be dangerous to go outside?" asked Mr. Damon.  "Shan't we
be struck by lightning? There is some protection in here."

"None at all," said Mr. Parker, quickly. "This mountain is a natural
lightning rod. To stay here in this cave will be sure death when the
storm gets directly over it. And that will be very soon. We must get on
insulated ground. Is there any part of this mountain that does not
contain iron ore?" the scientist asked of the former spirit.

"Yes; the way out by which we are going lands on a dirt hill."

"That's good; then we may be saved."

On they ran. They had no lanterns, but the blue light of the
electricity, as it leaped from point to point inside the cave, where
there were outcroppings of iron ore, made the place bright enough to

"Here we are!" cried Bill Renshaw at length. "Here's the way out!"

Making a sudden turn in the winding passage he showed the adventurers a
small opening in the side of the crag. In an instant they had passed
through, and found themselves in daylight once more. The sudden glare
almost blinded them, for, though the sky was overcast by clouds, from
which jagged tongues of lightning played, the outside was much lighter
than the dark cave.

"I should say it was a storm!" cried Tom Swift. "See, it is striking
every minute, and all around us!"

In fact, lightning bolts were falling on every side of the adventurers.
Every time the balls of fire struck, they burst open great stones, or
seared a livid scar on the face of some cliff.  As for Tom and the
others, they stood on a dry dirt hill, in which, fortunately, there was
no iron ore. To this fact they undoubtedly owed their lives, though had
there been rain, to moisten the ground and make the earth a good
conductor of electricity, they probably would have been badly shocked.
But the electrical outburst was not accompanied by rain.

Tom looked up. He saw a compact mass of cloud moving toward the summit
of the mountain on the slope of which they stood. From this cloud there
played shafts of reddish-green fire.

"Look!" called the young inventor to Mr. Parker. The instant the latter
saw the cloud, he cried:

"We must get away from here by all means! That is the center of the
storm. As soon as it gets over the mountain, where that lightning rod
is, all the electrical fluid will be discharged in one bolt at the
mountain, and it will be destroyed! We must run, but keep on the dirt
places! Run for your lives!"

They needed no second warning. Turning, they fled down the steep side
of the mountain, slipping and stumbling, but taking care not to step on
any iron ore. Behind them flashed the lightning bolts.

Suddenly there was a most awful crash. It seemed as if the end of the
world had come, and the ear drums of Tom and his companion almost burst
with the fearful report. The concussion knocked them down, and they lay
stunned for a moment.

Following the terrible report there was a low, rumbling sound.  Hardly
knowing whether he was dead or alive, Tom opened his eyes and looked
about him. What he saw caused him to cry out in terror.

The whole mountain seemed bathed in fire. Great blue, red and green
flashes played around it. Then the towering cliff seemed to melt and
crumble up, and the great peak, the top of it containing the diamond
makers' cave, from which they had fled but a few minutes before, the
entire summit was toppled over into the valley on the other side, and
in the direction opposite to that where the adventurers stood.

Then came a profound silence, and the lightning ceased. The storm was
over, and only the rattle of stones and boulders, as they came to rest
in the valley below, reached the ears of our friends.

"Phantom Mountain has been destroyed, just as I said it would be,"
spoke Mr. Parker, solemnly. Once more he had prophesied correctly.

For a few minutes the adventurers hardly knew what to say. They arose
awkwardly from the ground where the shock had tossed them.  Then Tom
remarked, as calmly as possible:

"Well, it's all over. I guess we may as well get back to our airship."

"What became of Munson and the others?" asked Mr. Damon.

Mr. Jenks pointed to the trail, far below. The figures of some men,
running madly, could be seen.

"There they go," he said; "I fancy we have seen the last of them." And
they had, for some time at least.

There was little use lingering any longer on Phantom Mountain--indeed
little of it was left on which to remain. Looking back toward the place
where the cave had been, Tom and the others started forward again. The
diamond-making machinery had all been destroyed. So, also, had the
finished diamonds stored in the cavern and the large supply which had
probably been made by the last terrific crash. No one would ever have
them now. Tom and Mr. Jenks felt a sense of disappointment, but they
were glad to have escaped with their lives. They sought their former
camp, but the tent and all their food was buried under tons of earth
and rocks.

Three days later, after rather severe hardships, they were near the
place where they had left the Red Cloud. They had suffered cold and
hunger, for they had no food supplies, and, had it not been that Bill
Renshaw knew the haunts of some game, of which they managed to snare
some, they would have fared badly, for they had left their guns in the

"Well, there are the trees behind which I hope my airship is hidden,"
announced Tom, as they came to the spot. "Good old Red Cloud! Maybe we
won't do some eating when we get aboard, eh?"

"Bless my appetite! but we certainly will!" cried Mr. Damon.

"There's somebody walking around the place," spoke Mr. Jenks.

"I hope it's no one who has damaged the ship," came from Tom,
apprehensively. He broke into a run, and soon confronted an aged miner,
who seemed to have established a rude sort of camp near the airship.

"Is anything the matter?" asked Tom, breathlessly. "Is my airship all

"I guess she's all right, stranger," was the reply. "I don't know much
about these contraptions, but I haven't touched her. I knowed she was
an airship, for I've seen pictures of 'em, and I've been waiting until
the owner came along."

"Why?" asked Tom, wonderingly.

"Because I've got a proposition to make to you," went on the miner, who
said his name was Abe Abercrombie. "I've been a miner for a good many
years, and I'm just back from Alaska, prospecting around here. I
haven't had any luck, but I know of a gold mine in Alaska that will
make us all rich. Only it needs an airship to get to it, and I've been
figuring how to hire one. Then I comes along, and I sees this big one,
and I makes up my mind to stay here until the owners come back. That's
what I've done. Now, if I prove that I'm telling the truth, will you go
to Alaska--to the valley of gold with me?"

"I don't know," answered Tom, to whom the proposition was rather
sudden. "We've just had some pretty startling adventures, and we're
almost starved. Wait until we get something to eat, and we'll talk.
Come aboard the Red Cloud," and the lad led the way to his craft which
was in as good condition as when he left it to go to the diamond cave.
Later he listened to the miner's story.

Tom Swift did go to the valley of gold in Alaska, and what happened to
him and his companions there will be told of in the next volume of this
series, to be called "Tom Swift in the Caves of Ice; or, the Wreck of
the Airship."

It did not take our friends long, after they had eaten a hearty meal,
to generate some fresh gas, and start the Red Cloud oh her homeward
way. Tom wanted to take Bill Renshaw with him, but the old man said he
would rather remain among the mountains where he had been born. So,
after paying him well for his services, they said good-by to him.
Abercrombie, the miner, also remained behind, but promised to call and
see Tom in a few months.

"Well, we didn't make any money out of this trip," observed Mr. Jenks,
rather dubiously, as they were nearing Shopton, after an uneventful
trip. "I guess I owe you considerable, Tom Swift. I promised to get you
a lot of diamonds, but all I have are those I had from my first visit
to the cave."

"Oh, that's all right," spoke Tom, easily. "The experience was worth
all the trip cost."

"Speaking of diamonds, look here!" exclaimed Mr. Damon, suddenly, and
he pulled out a double handful.

"Where did you get them?" cried the others in astonishment.

"I grabbed them up, as we ran from the cave," said the eccentric man;
"but, bless my gaiters! I forgot all about them until you spoke. We'll
share them."

These diamonds, some of which were large, proved very valuable, though
the total sum was far below what Mr. Jenks hoped to make when he
started on the remarkable trip. Tom gave Mary Nestor a very fine stone,
and it was set in a ring, instead of a pin, this time.

On their arrival in Shopton, where Mr. Swift, the housekeeper, Mr.
Jackson and Eradicate Sampson were much alarmed for Tom's safety, an
attempt was made to manufacture diamonds, using a powerful electric
current instead of lightning. But it was not a success, and so Mr.
Jenks concluded to give up his search for the secret which was lost on
Phantom Mountain.

And now we will take leave of Tom Swift, to meet him again soon in
other adventures he is destined to have in the caves of ice and the
valley of gold.




  Or Fun and Adventure on the Road
  Or The Rivals of Lake Carlopa
  Or The Stirring Cruise of the Red Cloud
  Or Under the Ocean for Sunken Treasure
  Or The Speediest Car on the Road
  Or The Castaways of Earthquake Island
  Or The Secret of Phantom Mountain
  Or The wreck of the Airship
  Or The Quickest Flight on Record
  Or Daring Adventures In Elephant Land
  Or Marvelous Adventures Underground
  Or seeking the Platinum Treasure
  Or A Daring Escape by Airship
  Or The Perils of Moving Picture Taking
  Or On the Border for Uncle Sam
  Or The Longest Shots on Record
  Or The Picture that Saved a Fortune
  Or The Naval Terror of the Seas
  Or The Hidden City of the Andes



In these stories we follow the adventures of three boys, who, after
purchasing at auction the contents of a moving picture house, open a
theatre of their own. Their many trials and tribulations, leading up to
the final success of their venture, make very entertaining stories.


Or Opening a Photo Playhouse in Fairlands.

The adventures of Frank, Randy and Pep in running a Motion Picture
show. They had trials and tribulations but finally succeed.


Or The Rival Photo Theatres of the Boardwalk.

Their success at Fairlands encourages the boys to open their show at
Seaside Park, where they have exciting adventures--also a profitable


Or The Mystery of the Missing Cash Box.

Backed by a rich western friend the chums established a photo playhouse
in the  great metropolis, where new adventures await them.


Or The Film that Solved a Mystery.

This time the playhouse was in a big summer park. How a film that was
shown gave a clew to an important mystery is interestingly related.


Or The First Educational Photo Playhouse.

In this book the scene is shifted to Boston, and there is intense
rivalry in the establishment of photo playhouses of educational value.


Or The Greatest Film Ever Exhibited.

The chums go to San Francisco, where they have some trials but finally
meet with great success.


Or The Film that Won the Prize.

Through being of service to the writer of a great scenario, the chums
are enabled to produce it and win a prize.



Never was there a cleaner, brighter, more manly boy than Frank Allen,
the hero of this series of boys tales, and never was there a better
crowd of lads to associate with than the students of the School. All
boys will read these stories with deep interest. The rivalry between
the towns along the river was of the keenest, and plots and
counterplots to win the champions, at baseball, at football, at boat
racing, at track athletics, and at ice hockey, were without number. Any
lad reading one volume of this series will surely want the others.

  Or The All Around Rivals of the School

  Or Winning Out by Pluck

  Or The Boat Race Plot that Failed

  Or The Struggle for the Silver Cup

  Or Out for the Hockey Championship

  Or A Long Run that Won

  Or Stirring Doings on Skates and Iceboats

12mo. Illustrated. Handsomely bound in cloth, with cover design and
wrappers in colors.




The outdoor chums are four wide-awake lads, Sons of wealthy men of a
small city located on a lake. The boys love outdoor life, and are
greatly interested in hunting, fishing, and picture taking. They have
motor cycles, motor boats, canoes, etc., and during their vacations go
everywhere and have all sorts of thrilling adventures. The stories give
full directions for camping out, how to fish, how to hunt wild animals
and prepare the skins for stuffing, how to manage a canoe, how to swim,
etc.  Full of the spirit of outdoor life.

  Or The First Tour of the Rod, Gun and Camera Club.

  Or Lively Adventures on Wildcat Island.

  Or Laying the Ghost of Oak Ridge.

  Or Rescuing the Lost Balloonists.

  Or Perilous Adventures in the Wilderness.

  Or The Rivals of the Mississippi.

  Or The Rival Hunters at Lumber Run.

  Or The Golden Cup Mystery.

*** End of this LibraryBlog Digital Book "Tom Swift Among the Diamond Makers, or, the Secret of Phantom Mountain" ***

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