The Drowned Man

Chief Insp. Peter Cammon is supposed to be retired, but he's reluctantly agreed to travel to Canada to retrieve the body of a murdered colleague. And once he's involved, he can't resist delving into the oddities of the crime.

His fellow cop was brutally attacked, run over by a car, and then dumped into a canal-all seemingly linked to the theft of three letters from the American Civil War era, one of which may have been signed by John Wilkes Booth.