1941. France asleep in the nineteenth century, governed by steam and Napoleon V, where scientists vanish mysteriously. Avril (Marion Cotillard), a teenage girl, goes in search of her missing scientist parents.
A psychiatric hospital patient pretends to be crazy. In charge of caring for this patient, a caregiver will begin to doubt the mental state of his "protégé".
As Jean, a conservative, campaigns to be reelected mayor of a small town in northern France, Edith, his spouse of 40 years, tells him a secret he can no longer repress: in his heart, he is ...