France in the fifties. The teenage orphan Sylvie is put in an institution for "fallen" or endangered girls, subjected to harsh treatment by the bigoted nuns who run the institution like a prison. Sylvie befriends a girl who wants to escape.

While she was jogging Lisa Campion , the daughter of the retired police officer Fabio Campion , discovered the frozen corpse of Julien , a child who disappeared 20 years ago.The police officer Simon Beauregard is then sent to Roches Noires , a village of the Tarentaise Valley, for the criminal investigation.