Christiane, 86 years old with a vibrant sense of humor, lives alone in a large apartment in the heart of Paris. Her daughter, Catherine, is her total opposite: sullen and uptight, filled with resentment toward her unfaithful Milanese husband. After discovering yet another affair, Catherine takes refuge in Paris at her mother’s home, accompanied by her own daughter, Luna. Christiane --- who, in spite of occasional dalliances on both sides, lived a beautiful love story with her late husband --- uses all of her freethinking charm in an effort to change Catherine’s rigid, self-pitying attitude.