This thin French drama takes place on a barren prison island. Pierre (Omar Sharif) has been sentenced to a life of hard labor on an island which lacks even a proper prison building: the men live in tents year 'round. Despite the grim conditions and brutal guards, he manages to hold his temper in check. His wife (Florinda Bolkan) campaigns for the right to visit him and finally succeeds. His inner discipline disturbed by her visit, Pierre reacts almost normally to abuse from a guard, and tragedy follows.

A veteran paratrooper murders his Vietnamese wife when he finds her in the arms of a younger man. Garal (Maurice Ronet) makes it back to the army base where his drunken roommate provides him with an iron clad alibi. Jauran (Michel Bouquet) is the local police inspector who befriends the Garal, unaware he is the killer. The younger man is accused of the woman's murder, but the paratrooper begins to feel overwhelmed with guilt. The longer he remains silent about the crime, the more psychological torture he must endure.