La caza. Monteperdido

A team from the UCO, led by Lieutenant Gloria Mencía, travels to the Irati Forest to investigate a crime. Lieutenant Ernesto Selva reunites with Sara Campos, who now works as a psychologist in the Criminal Behavior Analysis Section of the Civil Guard.

Suspicion falls on Eneko, Laia and Julen's son, who had mysteriously disappeared in the Irati Forest three years earlier. But the Civil Guard is beginning to focus on Aimar, the leader of the small group of teenagers from the town.

The discovery of a new body in the jungle further complicates matters. Suspicions about the teenagers grow, as does tension between them, while the appearance of strange figures sparks an argument between Aimar and Edurne.

Edurne doesn't show up. Víctor argues with Sara and blames Aimar for her disappearance and the murders. Upon discovering what happened to the German on Aimar's cell phone, the Civil Guard suspects Julen hasn't told them everything.

Edurne remains trapped in the cave. Julen is detained as a suspect and tells the Civil Guard everything that happened the day his son disappeared. The UCO uncovers the illegal logging business.

The UCO transports the two teenagers, who were living isolated in the forest, to the hospital, where they undergo various tests. They need to know who they are, and above all, they need to know their connection to the outside world.

The UCO searches for Jan while his children begin to understand that their father has deceived them. Sara begins to realize her mental state. Selva realizes she's unwell, follows her, and Sara confesses what happened.

Season finale. The agents discover what really happened when Laia was murdered. Sara knows she must say goodbye to Víctor and must decide whether to return to Monteperdido with her daughter or stay to help her colleagues.