Agnes (Marlene Jobert) is in her 30s, and has been married to her womanizing and callous husband long enough to have a young son, whom she loves dearly. While driving through a game preserve near Paris, her car bangs into the car of a divorced man. The two of them fall in love almost instantly. However, once Agnes' husband's suspicions are aroused, he threatens to alienate the boy from her. Reluctantly, she and her new love part for a time.