From the harsh post-war years' Catalan countryside, a child that goes back to the side, Andreu, finds his son at the woods and the corpses of a man. Andreu tries to help his dad by finding who truly killed them, although the authorities need his dad to be left responsible of these deaths. In this investigation, Andreu develops a moral consciousness contrary to a world of adults fed up by lies. As a way to survive, he betrays their or her own roots and eventually ends up finding out the monster which lives within him.