- 1Chapter I — A Five Dollar Bill
- 2Chapter II — Counterfeit Money
- 3Chapter III — The Hardy Boys at School
- 4Chapter IV — Another Victim
- 5Chapter V — Curing the Joker
- 6Chapter VI — The Old Mill
- 7Chapter VII — In the Mill Race
- 8Chapter VIII — Joe’s Courage
- 9Chapter IX — The Rescue
- 10Chapter X — The New Boat
- 11Chapter XI — A Man in a Hurry
- 12Chapter XII — Seasick
- 13Chapter XIII — Paul Blum
- 14Chapter XIV — Con Riley Guards a Package
- 15Chapter XV — The Chase
- 16Chapter XVI — A Plan of Action
- 17Chapter XVII — What Lester Said
- 18Chapter XVIII — Suspicions
- 19Chapter XIX — The Rug Buyer
- 20Chapter XX — A Note of Warning
- 21Chapter XXI — At the Mill
- 22Chapter XXII — Through the Roof
- 23Chapter XXIII — The Alarm
- 24Chapter XXIV — Trapped
- 25Chapter XXV — The Reckoning
The Secret of the Old Mill
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