In modern-day London, a sex criminal known as the Necktie Murderer has the police on alert, and in typical Hitchcock fashion, the trail is leading to an innocent man, who must now elude the law and prove his innocence by finding the real murderer. Jon Finch, Alec McCowen and Barry Foster head this British cast in the thriller that alternates suspense scenes with moments of Hitchcock's distinctive black humor. Screenplay by Anthony Shaffer.