The disappearance of the teenager Sarah Leroy sent shockwaves through the small town of Bouville-sur-Mer. A suspect was quickly arrested. Yet, in the village, people continued to speculate. No one ever found out what really happened. Years later, journalist Fanny returns to the scene of the tragedy that marked her youth. Sarah's story is also, in a way, her own, her sister's, and that of a group of girls who knew Sarah all too well ...