Paul and Charlotte are in love. Charlotte discovers she has a grave malady and Paul supports her. But Paul is also attracted to Ninon, another girl. Charlotte accepts Paul to have an affair with her, and the three start a difficult and ambiguous relationship.
A couple have a peaceful existence in a small provincial town. He is a teacher and she runs an opticians practical. Their life is turned upside when Belle, a friend’s daughter who is lodging with them, is found dead in her room. The husband becomes the prime suspect as the only one at home at the time.
