In the near future, and maybe even next year, more and more people will gradually turn into beasts. In France, a mysterious disease is beginning to change the definition of what a human being is. The mutants are separated from society by the authorities, but while transporting patients to a special isolation ward, the medical transport is involved in an accident and some of them disappear. Francois, the husband of one of the condemned "mutants", is determined to change his life and that of his son Emile and desperately search for her. The desire to recover the person they love will lead them down the most unexpected paths and make them grow up - perhaps not only with their son, but with all of us who think we are superior to nature.