The film talk about a planet similar to Earth but smaller than it. In that world, people live differently, they communicate by telepathy, they can teleport through the space. Their peace and serenity is affected when a meeting people decided to do an expedition to the Earth, to learn how is the civilization that lives there. Mila, a woman, will volunteer who dares to come down to Earth. She arrives in Paris. There, Mila will live a lot of funnies and ridiculous situations. This film is the Marion Cotillard's second film.