Isabelle, a young girl on holiday with her family in France, disappears with a man she meets online - unaware of his troubled past and twisted sexual nature. Not knowing what's become of her, we follow Etienne as he drives frantically across the country and share in the long anguish of the missing girl's family as the police fail to find her. Meanwhile, a young woman's strangled body is found on a beach. In the deep heart of France, an old woman prays to a long dead archbishop whose biography Isabelle's mother is writing - entreating that he intercede with the Almighty for the girl's safe return, as a young parish priest, the old woman's protege who's fallen guiltily in love with the missing teenager, sets out on a mission to find her.