Stretched across the road was the body of a policeman. On the way home one evening in the Romney Marsh, Bookseller Theodore Terhune and friend Julia are caught in heavy coastal fog. A passing lorry provides some guidance on the narrow country roads, but the night ends with intentional mishap and a dead body. It becomes clear that the constable's death was not accidental, but what possessed Tom Kitchen to try to stop a lorry singlehandedly...