- 1Preface
- 2Chapter I — My Learned Brother
- 3Chapter II — The Suspect
- 4Chapter III — A Lady in the Case
- 5Chapter IV — Confidences
- 6Chapter V — The ‘Thumbograph’
- 7Chapter VI — Committed for Trial
- 8Chapter VII — Shoals and Quicksands
- 9Chapter VIII — A Suspicious Accident
- 10Chapter IX — The Prisoner
- 11Chapter X — Polton Is Mystified
- 12Chapter XI — The Ambush
- 13Chapter XII — It Might Have Been
- 14Chapter XIII — Murder by Post
- 15Chapter XIV — A Startling Discovery
- 16Chapter XV — The Finger-Print Experts
- 17Chapter XVI — Thorndyke Plays His Card
- 18Chapter XVII — At Last
The Red Thumb Mark
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