CHAPTER I
MYSTERIOUS FORCES
CHAPTER II
TOM SWIFT’S INVENTION
CHAPTER III
A SUBMARINE VISITOR
CHAPTER IV
RIVAL BIDDERS
CHAPTER V
A STARTLING DEMONSTRATION
CHAPTER VI
ABOARD THE SUBMARINE
CHAPTER VII
KNOCKED OUT
CHAPTER VIII
SUSPICIONS
CHAPTER IX
HELD FAST
CHAPTER X
A MIDNIGHT RAID
CHAPTER XI
KOKU’S SOUVENIR
CHAPTER XII
DANGEROUS SPARKS
CHAPTER XIII
THE SUBMARINE MAGNET
CHAPTER XIV
INTO THE LAKE
CHAPTER XV
A PRACTICAL TEST
CHAPTER XVI
FLICKERING TONGUES
CHAPTER XVII
KOKU GETS THE REST
CHAPTER XVIII
OFF TO TURTLE BAY
CHAPTER XIX
CAUGHT IN THE STORM
CHAPTER XX
AT THE WRECK
CHAPTER XXI
BAD NEWS
CHAPTER XXII
AN APPEAL FOR HELP
CHAPTER XXIII
TO THE RESCUE
CHAPTER XXIV
WORKING AGAINST TIME
CHAPTER XXV
THE S.V.J. 13
