With his wife in labor, father-to-be Thomas (Malik Zidi) speeds to the hospital, and in the process, accidentally kills a young man on the road. That death sets into motion events that will change everyone's lives forever, including the young man's mother, Marie-France (Nathalie Baye), who cannot recover from the trauma. Nine years later, Marie-France takes a job as Thomas's assistant, without him knowing about her connection to his past. Her maternal rage has tragic consequences as she insinuates herself into Thomas's life, work and family. A thriller in the vein of classic Hitchcock.