A man (Derek Bond) having an affair (Nicole Maurey) expects his wife to die, but when she recovers, they come up with a plot to kill her and think they have a foolproof plan to get away with murder. The film is all about the investigation by the policeman as he attempts to prove the husband killed his wife and how he did it. In many ways this is a drab British murder film, but it in intriguing to see how the investigation unfolds.