“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.