Marilyne, a young French girl, is studying in Paris, where she lives a quiet and peaceful life in the company of Herve, a young faculty member. Her life is altered by the behavior of her mother Paula, a woman immersed in vice and corruption, dominated by an easy disposition to love the young people who come to her. Arrangement that leads her to feel a deep passion for her daughter's boyfriend, thus breaking the tranquility of the two young people.