In Salvador de Bah?a, Agent Cardona hopes Santo's mistress might reveal the narco's whereabouts. In Madrid, Inspector Mill?n tracks down a suspect.

After being rescued in Madrid, Cardona tries to remember what happened to him and B?rbara while they were kidnapped. Mill?n investigates the Norwegians.

As Cardona recalls more about the terrifying rituals he endured while held hostage, Mill?n investigates one of Santo's men who was operating in Spain.

In the past, Cardona journeys to the depths of hell while working undercover in the cartel. In the present, he ends up in Mill?n's crosshairs.

Cardona and B?rbara try to evade police custody while Mill?n navigates an internal affairs investigation into his past conduct.

As Mill?n and Cardona finally close in on Santo's location, they draw everyone around them - including their loved ones - into danger.