- 1Chapter I — Overboard
- 2Chapter II — The Rescue
- 3Chapter III — Miss Todd
- 4Chapter IV — Concerning Todham Todd
- 5Chapter V — Plans for a Trip
- 6Chapter VI — The Missing Motorcycle
- 7Chapter VII — Carl Schaum
- 8Chapter VIII — Strange Doings
- 9Chapter IX — The Storm
- 10Chapter X — The Cave
- 11Chapter XI — Footsteps in the Night
- 12Chapter XII — A Disappearance
- 13Chapter XIII — Stolen Supplies
- 14Chapter XIV — Captain Royal
- 15Chapter XV — The Old Sailor
- 16Chapter XVI
- 17Chapter XVII — The Man on the Shore
- 18Chapter XVIII — The Prisoner
- 19Chapter XIX — Clippings
- 20Chapter XX — The Shotgun
- 21Chapter XXI — Over the Cliff
- 22Chapter XXII — In Swirling Waters
- 23Chapter XXIII — Back to Bayport
- 24Chapter XXIV — At the Hospital
- 25Chapter XXV — The Last of Captain Royal
The Secret of the Caves
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