Wisi is in trouble. He arrives in Bordeaux in the hope of finding a job and crosses paths with Marina, a humanitarian with a big heart. To get accommodation with her, he pretends to be undocumented. One evening, he meets Jérôme, himself on the street after the death of his mother.
The Bouvier-Sauvages, a large aristocratic family, meet the much more modest Martin family when their children's wedding is announced. For the occasion, the future bride and groom offer their parents DNA tests, which will reveal their true origins. The results are totally unexpected and will make the effect of a bomb.
In a world hit by a wave of mutations transforming humans into animals, François does everything he can to save his wife. As some of the creatures disappear into a nearby forest, he and their son Émile embark on a quest that will change their lives forever.