Sébastien Marnier's subversive satire takes place in a luxurious seaside villa, where a modest young woman (Call My Agent's Laure Calamy) finds herself in the company of a strange family: an unknown and wealthy father, his extravagant wife, his daughter, an ambitious woman, a rebellious teenager, and their creepy maid. Someone is lying. Between suspicions and deceit, a mystery grows and mistrust spreads.