Follows a doctor and his team in a French adolescent psychiatry unit. When 17-year-old Lucia is brought back by police, the arrival of a new patient threatens to shatter the fragile balance of the ward.

In a world without loneliness in which everyone shares their life with their double, Lucienne is in a relationship with Paul, a former lover who has lost his twin. While she wants his love, he just wants to find his brother. Individualism and exclusive relationships are not tolerated in this world, generating more disgust from Lucienne. Her desire drives her away from her sister and probably from Paul.

Joseph Cross looks like his job. Solid like concrete. Married, two children, his existence is perfectly organized. Yet this night, alone behind the wheel, he must make a decision that could ruin his life.