From the harsh post-apocalyptic years' Catalan countryside, a young child that belongs for the side, Andreu, discovers the corpses of a man and his son in the forest. The police want his dad to be left responsible however, Andreu tries to help his father by finding out who truly killed them. Within this search, Andreu develops a moral consciousness contrary to a world of adults. As a way to live, he betrays their roots and eventually ends up finding out the monster which resides within him.