The quiet life of Commissioner Adamsberg is overshadowed by several circumstances: someone in the area is mocking pigeons, the corpse of an industrial magnate is found in a burnt Mercedes; A quiet, shy woman appears at the police headquarters and tells a medieval legend about the Army of Satan. It is her story that prompts Adamsberg to go to a provincial town, which suddenly becomes the scene of diabolical forces taking up arms against civilians. And it all begins, as in the fairy tale “Tom Thumb,” with bread crumbs!