After living in the North of England, Lenz returns to Paris, the city where he stayed for some time. He learns the strange disappearance of his mother, Madeleine and sets out to find her. For help, he can count on his friend, Louis. He meets Hélène who has lived in Paris for years. She is German and works as a nurse and married to Paul. She does not recover from the death of her child. This personal drama shook the couple. Paul is still in love with her but, bruised and feeling misunderstood, she has moved away. To forget her grief, she physically hurts herself. He also meets young Léna, a singer who has an overprotective father. She is Louis' girlfriend but she wants to live with Lenz, but he refuses her. This makes her very jealous.