Marie-Dominique has been married to Bertrand for 15 years. They have a young son, a lovely home and a seemingly blissful marriage. But Marie-Dominique has reached the end of her rope, sick of her husband's obsession with cycling and his self-centred ways, she embarks upon a passionate affair with Antoine, a lonely scriptwriter who treats her with the respect and understanding which Bertrand lacks. Marie-Do soon arrives at the decision to end things with Bertrand in order to begin a new life with Antoine. But Bertrand refuses to leave their apartment...