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 little girl lives in a very grown-up world with her mother, who tries to make sure she is prepared for it. Her neighbor The Aviator, introduces the girl to an extraordinary world where anything is possible, the world of The Little Prince.