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Newly engaged to an American girl named Sally Benner (Sally Kellerman), London policeman Tommy Bonn (Ron Randell) brings his sweetheart back home, only to find that he has been assigned to track down a strangler. The situation gets personal when, while taking a nocturnal stroll in the London fog, Sally disappears. The subsequent events not only involve Sally and Tommy, but also Tommy's partner, Stephen Leslie (Michael Pate), and a disturbed young man named Clarke (David Carradine) -- who apparently has a compulsion to confess to every crime that occurs.