While vacationing with her family, 14-year-old Lili (Delphine Zentout) vows to lose her virginity. She attracts the attention of a good-looking, middle-aged playboy (Jean-Pierre Léaud) and seduces him with the skill of an adult and the naiveté of a child. But another chance encounter with a musician furthers her journey toward sexual awakening in this film based on the popular novel by writer-director Catherine Breillat.