A young groom enlists private investigator William Monk to track down his fiancee, Miriam Gardiner, who disappeared suddenly from a party at a luxurious Bayswater mansion. But Monk soon finds the coach in which Miriam fled and nearby, the murdered body of the coachman. There is no trace of Miriam. Monk and Hester, newly married, chase down the clues as to why Miriam would run away from a marriage that promised so much…