Las Cumbres Boarding School is an impenetrable fortress built on the edge of a cliff where students are subjected to strict discipline and it seems impossible to escape. Two of them manage to run into the woods one night, but things take a turn for the worse because surviving outside the school is even more dangerous than inside and the woods are much more terrifying.

Adéle blames Amaia for the party and she’s accused of tattling. Paul and Amaia take Paz and Eric to see a mysterious painting with crow-men, but they find something terrifying instead. Inés undergoes treatment and takes pills that give her hallucinations. Elías and Elvira feel an increasingly irresistible attraction and Paul and Amaia will discover something about Las Cumbres.

Seeking to distance himself and Paula from the menacing school, Marcos readies to sign Héctor off as their guardian, but two investigations lead him to an impasse with no one to trust.

With police on hand to investigate the whereabouts of a missing person, existence of the gnome becomes public. Will the lesson of judging a book by its cover intercede before tragedy strikes?

Repeat visits from an owl convince Paula in the gnome's reincarnation, Iván can't believe he killed a man, Fermin fights for his life while losing the paintings, the gang discovers a second door, and Saúl preps a new operative.

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Amaia is lost in the woods when she’s found and taken back to the school where she becomes obsessed with convincing Paul and his friends of what she saw and reporting it. But students at the school are cut off from the outside world. In the library, they find drawings of men wearing bird-like masks that confirm Amaia’s story, but something terrible shocks them all.

Adéle tells Alba’s secrets, which surprise everyone. Darío takes his daughter Inés home, near the school, where she has very strange visions. An unexpected postcard from Manuel assuring that he’s all right discredits Amaia’s story about his disappearance. León sneaks into Darío and Inés’ home, the students organize a secret party and Elías and Elvira grow closer.

The Las Cumbres prior believes the devil runs rampant in the monastery. Amaia discovers a supernatural tie between her and Inés. Elías feels extremely guilty after what happened with Elvira. Meanwhile, Paul finds something in his cell that makes him suspect the friar. Eric suffers a strange blackout and Paul and Amaia follow a clue to find the Crow’s Nest.

Amaia and Paul manage to find the Crow’s Nest. Meanwhile, Inés wakes up confused in the middle of the woods and when she sees León, she runs in terror. We go back in time to discover the secret behind Inés’ connection to León. Eric suffers another episode of memory loss. Elías notices some strange behaviors, which start to raise his suspicions.

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The friends mourn Manuel. The prior discovers Elías has broken his vow of chastity and sends him to another monastery. Meanwhile, Elvira tries to share everything she knows and Inés starts putting pieces about her past together. But a new and unexpected death enrages the students, who start a rebellion at the school. Everything is out of control and we’re in for an unexpected ending.

Jacinta returns, but everyone's general happiness remains short-lived under Elsa's rule, and Marcos discovers a worrisome numerical connection between the dead orphans and his sister.

Elsa's ignorance of Julia's home life could cost her her career as head mistress. Fermin's inability to hide a serious injury could cost him his life.

To prove they're not related and can be together, Iván's cousin, Manuela Portillo, sends him an unexpected item - his own death certificate.

Christmas approaches and all but Marcos, Paula and Miguel pack for home. An unexpected snowstorm sets in, upsetting plans for some while revealing a hero and a traitor.

Nora impresses Héctor with keen powers of observation, but Fermin's expertise in forensics reveals a nearly 6' assailant shooting his nameless contact with Maria in the room. Her behavior points to Iván.

One student dead, another student missing, and the kids get framed when the headmaster's search turns up ecstasy among their possessions.