Felix is a middle-aged bourgeois husband. Much to his discomfort, he learns that his wife Gabrielle is carrying on with a young man--a very young man. Rather than express outrage, Felix decides that there's something lacking in him. He spends the rest of the picture trying to keep his wife by altering his own personality and outlook.
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Between eleven o’clock and midnight one evening, a notorious trafficker Jérôme Vidauban is shot whilst walking in a tunnel in Paris. The case is assigned to Inspector Carrel, who is Vidauban’s perfect double. Using his resemblance to the arch criminal, Carrel manages to infiltrate in Vidauban’s circle of acquaintances and contacts. He becomes embroiled in a bizarre web of intrigue and discovers no shortage of possible murder suspects, all of whom appear to be surprised to see him still alive.
