- 1Chapter One — Mr. Morgan Meets Tragedy
- 2Chapter Two — Inspector French Gets Busy
- 3Chapter Three — Experimental Detection
- 4Chapter Four — A Change of Venue
- 5Chapter Five — Messrs. Berlyn and Pyke
- 6Chapter Six — The Despatch of the Crate
- 7Chapter Seven — Dartmoor
- 8Chapter Eight — A Fresh Start
- 9Chapter Nine — A Step Forward
- 10Chapter Ten — London’s Further Contribution
- 11Chapter Eleven — John Gurney, Night Watchman
- 12Chapter Twelve — The Duplicator
- 13Chapter Thirteen — The Accomplice?
- 14Chapter Fourteen — French Turns Fisherman
- 15Chapter Fifteen — Blackmail
- 16Chapter Sixteen — Certainty at Last
- 17Chapter Seventeen — “Danger!”
- 18Chapter Eighteen — On Hampstead Heath
- 19Chapter Nineteen — The Bitterness of Death
- 20Chapter Twenty — Conclusion
The Sea Mystery
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