CONTENTS

CHAPTER
I [UNTOLD MILLIONS]
II [A STRANGE OFFER]
III [THINKING IT OVER]
IV [AGAINST HIS WILL]
V [BUSY DAYS]
VI [MARY'S ODD STORY]
VII [THE TRIAL TRIP]
VIII [THE MUD BANK]
IX [READY TO START]
X [STARTLING REVELATIONS]
XI [BARTON KEITH'S STORY]
XII [IN DEEP WATERS]
XIII [THE SEA MONSTER]
XIV [IN STRANGE PERIL]
XV [TOM TO THE RESCUE]
XVI [GASPING FOR AIR]
XVII [WHERE IS IT?]
XVIII [A SEPARATION]
XIX [THE SERPENT WEED]
XX [THE DEVIL FISH]
XXI [A WAR REMINDER]
XXII [STUDYING CURRENTS]
XXIII [AN UNDERSEA COLLISION]
XXIV [THE TREASURE SHIP]
XXV [THE STEEL BOX]