Three years after a meltdown in the nearby nuclear power plant devastated a rural, wooded area close to a major city in the north of Spain, Inspector Hector Uria returns to the police force after his treatment and recovery from being the only survivor among those who were the first to go in and help. But when a mutilated body turns up in the forbidden zone, Hector is drawn into an investigation that will put in question the new order established outside of the zone ever since the catastrophe took place.