What is the Clan? And how far does its influence reach? Every lead so far points to the Clan. This powerful criminal organisation has prominent figures from politics, business, the judiciary and the police at its service. Anyone who dares to defy the Clan dies. None of the officers has ever come up against killers as ruthless as the Clan. The Special Investigation Brigade, headed by Inspector Elena Blanco, takes on the toughest challenge in its history and tries to crack the organisation. But when Elena receives photographs showing Ángel Zárate lying on the ground in a pool of blood, she makes an unforgivable mistake. It will cost the whole team dearly. The discovery of a body with its internal organs removed changes the course of the investigation, and Blanco, now the subject of an arrest warrant, is ready for anything. Mariajo, Orduño and Reyes must wage war on the Clan on their own. The new inspector in charge of the Special Investigation Brigade does not make their task any easier – is she, too, an envoy of the Clan? Is her aim to destroy the unit and put Blanco behind bars?