The Dartmoor Enigma: An Inspector Richardson Mystery

"I'm writing to you about the death of Mr. Dearborn. You bet the murderer's laughing up his sleeve now that he's got away with it."

An inquest is held in South Devon on the death of a man apparently killed in a motor accident on Dartmoor: the verdict is "Death from misadventure." But soon afterwards Scotland Yard and the Devon Chief Constable receive anonymous letters alleging that the verdict was wrong; that the death was caused by blows inflicted by a person, or persons, unknown.

The Chief ...