Emma, a 17-year-old girl, sends a synopsis to a filmmaker whom she admires. Intrigued and seduced by this reading, Paul invites Emma to his home. The arrival of this groupie will seriously disturb the established order. Very quickly Emma is ready to love Margot, Paul's wife, very quickly she wants to identify with her daughter in everything. By turns friend, confidant, rival, victim, seducer and even manipulator, she interferes in their hearts and their lives.