XVI THE VAST CAVERN
XVII THE PHANTOM CAPTURED
XVIII BILL RENSHAW WILL HELP
XIX IN THE SECRET CAVE
XX MAKING THE DIAMONDS
XXI FLASHING GEMS
XXII PRISONERS
XXIII BROKEN BONDS
XXIV IN GREAT PERIL
XXV THE MOUNTAIN SHATTERED--CONCLUSION




CHAPTER I--A SUSPICIOUS JEWELER


"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.