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Many prisoners convicted of rape, murder and terrorism are released before serving their full sentences. Hours later, one of them is killed. The detectives Mora and Nieto take on the case.

Isabel and Nieto investigate a new attack. The terrorist Basauri was brutally beaten after being released. The rapist Haro takes advantage of his new freedom to spy on Isabel's life.

The police investigation of the murders becomes complicated. Haro's plans start to impact Isabel's life, and her mental stability is about to be put through a terrible test.

Worried by Isabel's mental health, Nieto tries to find a way to keep her away from the Parot case and not expose her to so much pressure.

The killer acts again, but this time, they lose their mask while escaping. The released prisoners start to protest in front of the police station and demand police protection.

The investigation takes Nieto to the city zoo. Somebody has freed all the monkeys from their cages. Haro continues playing with Isabel's mind.

The avenger commits another murder and Nieto continues to investigate despite the Commissioner's reproach. Haro participates in an interview with Ana to clean up his image in the media.

Despite the Parot case being assigned to another detective, Nieto pursues a new line of investigation on his own while Isabel tries to adapt to her new life in a mental institution.

Thanks to Nieto's investigation, the police discovers the identity of the murderer of the released prisoners and communicates it to the media. Haro contacts Isabel and forces her to meet with him.

Nieto desperately strives to find evidence and prove that the young police officer is the victim of a plan against her. Haro secretly approaches Sol to execute the last step of his revenge plan.