One hot summer's day in a little french town, a building worker accidentally finds the skeleton of a newborn baby and calls the police. Detective Jacques Deveure (Vincent Winterhalter) is placed in charge of the investigation. His investigation uncovers evidence of numerous shady dealings, revealing a strange underbelly of the private lives of a cadre of people including Grandier (Francois Berleand) and Blandine Piancet (Audrey Tautou). This multi-layered story continually unveils new twists and turns.

Coming out from jail, Lucas has decided to change his life and behave like a good citizen. But when he is taken hostage in a bank by a hare-brained robber, no cops can believe he is not part of the action.