An adventure between a father and his son, in a world where some humans have started mutating into other animal species.

In a world hit by a wave of mutations that are gradually transforming some humans into animals, François does everything he can to save his wife, who is affected by this mysterious condition. As some of the creatures disappear into a nearby forest, he embarks with Émile, their 16-year-old son, on a quest that will change their lives forever.