- 1Chapter I — A Mystery
- 2Chapter II — On Active Service Again
- 3Chapter III — A Lesson
- 4Chapter IV — Strange Warfare
- 5Chapter V — The End of Blosberg
- 6Chapter VI — With the Motorboat Fleet
- 7Chapter VII — An Enemy
- 8Chapter VIII — Frank in Trouble
- 9Chapter IX — Jack to the Rescue
- 10Chapter X — Lost — The Storm
- 11Chapter XI — On the Hunt
- 12Chapter XII — The First Victim
- 13Chapter XIII — A Desperate Venture
- 14Chapter XIV — With the Enemy
- 15Chapter XV — Plotting
- 16Chapter XVI — An Enemy Sunk
- 17Chapter XVII — An Argument Settled — Temporarily
- 18Chapter XVIII — Mistaken for an Enemy
- 19Chapter XIX — The Trap Is Set
- 20Chapter XX — The Trap Is Sprung
- 21Chapter XXI — At Sea Again
- 22Chapter XXII — Toward Ostend Again
- 23Chapter XXIII — An Unexpected Encounter
- 24Chapter XXIV — Another Unpleasant Surprise
- 25Chapter XXV — Doomed to Die
- 26Chapter XXVI — More Trouble
- 27Chapter XXVII — The Pirates Reappear
- 28Chapter XXVIII — The Battle and the Attack on the U-6
- 29Chapter XXIX — The End of a Traitor
The Boy Allies Under the Sea
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