- Chapter I An Appeal for Aid
- Chapter II Explanations
- Chapter III A Face at the Wi
- Chapter IV Tom's Experiments
- Chapter V Mary's Present
- Chapter VI Mr. Nestor's Lett
- Chapter VII Off for Peru
- Chapter VIII The Bearded Man
- Chapter IX The Bomb
- Chapter X Professor Bumper
- Chapter XI In the Andes
- Chapter XII The Tunnel
- Chapter XIII Tom's Explosive
- Chapter XIV Mysterious Disap
- Chapter XV Frightened Indian
- Chapter XVI On the Watch
- Chapter XVII The Condor
- Chapter XVIII The Indian Str
- Chapter XIX A Woman Tells
- Chapter XX Despair
- Chapter XXI A New Explosive
- Chapter XXII The Fight
- Chapter XXIII A Great Blast
- Chapter XXIV The Hidden City
- Chapter XXV Success
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