Even though the truth has come to light, Lucía is still missing. The events that took place in the village will forever mark the lives of its residents. Nothing will ever be the same again, not even for Sara. Risking her mental health, which is weaker than ever, Sergeant Campos will not give in. She has no intention of leaving this remote place in the Pyrenees without achieving what she came to do: find Lucía.

A discovery in the investigation will make Sara doubt Ana: has the girl been hiding something from the beginning? An unanswered question, since Ana has disappeared. While the search is organized to find her, with the parents in suspense, fearing to lose the daughter they had recovered, Sergeant Campos comes to understand what happened during those years of kidnapping, the terrible truth. However, it is possible that, by the time she succeeds, it will already be too late.

The investigation disrupts the lives of Lucía's parents, who become increasingly convinced they will never see their daughter alive. While Ana finds stability within her family, the townspeople see their lies and most intimate secrets exposed by the Civil Guard. No one is safe.

Sergeant Sara Campos tries to overcome this and finds a clue that brings her a little closer to Lucía. Ana begins to lose her fear and begin to trust Quim. The facts become increasingly clear: the kidnapper lives among the residents of Monteperdido.

Lieutenant Baín and Sergeant Sara Campos are managing to piece together the years of Ana and Lucía's kidnapping. They learn more and more about the kidnapper and better understand the hell the girls suffered. However, Lucía's parents, especially Joaquín, are not willing to stand idly by. That's why they don't hesitate to use Ana to try to precipitate events and find Lucía as soon as possible. But one event marks a dramatic turn in the course of the investigation and in Sara Campos's life.

The Civil Guard arrests the first suspect in the case, and this is not well received in Monteperdido. The officers are getting closer to the truth, but the townspeople are uncomfortable with the investigation, feeling treated as if everyone were a suspect. They let Corporal Víctor Gamero know this, and he eventually confronts Sergeant Sara Campos. Meanwhile, Ana tries to return to "normal life." This is not easy. Her return has been a bombshell, resurfacing old secrets that will put the lives of some Monteperdido residents at risk.

In the second episode of "La Caza. Monteperdido," Lieutenant Santiago Baín and Sergeant Sara Campos know they are in Ana's hands. The girl, who has returned after five years of kidnapping, is all they have to figure out what happened. However, Ana's testimony provides little information. She can't identify her captor, as he always wore a mask. The officers' work focuses on trying to locate the hideout where they were held hostage and where they suspect Lucía still is. Throughout this search, Santiago and Sara will realize that the man they are looking for is someone from the town itself. Perhaps someone very close to Ana.

Ana and Lucía disappear in Monteperdido as they leave school. Five years later, one of the girls reappears; she's been in a car accident. She's unconscious, and the driver is dead. This news will turn the lives of the affected families upside down. Lieutenant Santiago Baín and Sergeant Sara Campos, officers from the UCO (National Police Unit), arrive in town to take charge of the case. The investigation turns out to be a race against time: assisted by Corporal Víctor Gamero, they will have to answer two fundamental questions: who is the deceased man they found in the car? Where is the other girl who disappeared five years ago?