CHAPTER I
IN THE SECRET VAULT
CHAPTER II
THE INTRUDER
CHAPTER III
KOKU SEES A MAN
CHAPTER IV
A SLENDER CLUE
CHAPTER V
THE TWISTING FOOT
CHAPTER VI
A TELEVISION DETECTOR
CHAPTER VII
THE LEOPARD’S SPOTS
CHAPTER VIII
THE SECRET CODE
CHAPTER IX
UNKNOWN TERROR
CHAPTER X
TOM’S WILD DANCE
CHAPTER XI
SEEING IN THE DARK
CHAPTER XII
CATCHING MR. DAMON
CHAPTER XIII
THE LEOPARD’S LAIR
CHAPTER XIV
THE CRYSTAL CAVE
CHAPTER XV
THE ESCAPE
CHAPTER XVI
A SINISTER WARNING
CHAPTER XVII
KIDNAPPED
CHAPTER XVIII
DESPERATE SEARCHING
CHAPTER XIX
IN CAPTIVITY
CHAPTER XX
A DIRE THREAT
CHAPTER XXI
TOM SWIFT DECIDES
CHAPTER XXII
THE CODE MESSAGE
CHAPTER XXIII
THE WATER TOWER
CHAPTER XXIV
CLOSING IN
CHAPTER XXV
THE RESCUE
