Hélène's case: Devastated by the brutal death of her son, Hélène tries to understand what really happened that night. He couldn't drive drunk, he had promised her, he never lied to her. If the police conclude in a banal traffic accident, Hélène, for her part, is absolutely convinced that her son has crossed paths with a driver. After having discreetly carried out the investigation without the knowledge of the police, she manages to find his trace. And to make him confess, she decides to come into his life to extract a confession from him. She is ready to do anything, even to seduce him, to put his mistrust to sleep ...