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As private investigator William Monk listens to young Lucius Stourbridge plead for help in tracking down his runaway finacee, he feels a sense of heavy foreboding. Miriam Gardiner disappeared suddenly from a croquet party at the luxurious Bayswater mansion of her in-laws-to-be, and has not been seen since. But on Hampstead Heath, Monk finds the coach in which Miriam had fled and, nearby, the murdered body of the coachman. There is no trace of Miriam.