The Boarding School: Las Cumbres

Las Cumbres Boarding School is a remote educational institution located on a cliff, known for its strict control and harsh conditions, offering students little opportunity for freedom. Two students attempt to escape into the surrounding woods one night, only to find that the dangers they encounter outside the school are far greater than they had anticipated.

After being lost in the woods and rescued, Amaia becomes determined to convince Paul and his friends of a disturbing discovery. However, the students at the isolated school face obstacles due to their limited contact with the outside world. In the library, they find drawings of men in bird-like masks that support Amaia's account, but they are soon confronted with a shocking revelation.

Adéle uncovers surprising secrets about Alba, which astonish those around her. Darío relocates his daughter Inés closer to the school, where she starts having strange visions, and a postcard from Manuel raises questions about Amaia's version of his disappearance. At the same time, León sneaks into Darío and Inés's home under the cover of night, students organize a secret party, and Elías and Elvira grow closer.

Adéle blames Amaia for tattling and holds her responsible for a party. At the same time, Paul and Amaia take Paz and Eric to investigate a mysterious painting depicting crow-men, only to come across something unsettling. Inés suffers hallucinations caused by her medication, while Elías and Elvira grow closer as Paul and Amaia uncover secrets related to Las Cumbres.

The Las Cumbres prior becomes increasingly convinced that demonic forces are at work within the monastery. Amaia uncovers a mysterious connection between herself and Inés, while Elías wrestles with guilt over his past actions. Paul discovers a suspicious item in his cell, leading him and Amaia to investigate the Crow’s Nest after Eric experiences an unexplained blackout.

Amaia and Paul find the Crow’s Nest, while Inés wakes up confused in the forest and runs in fear when she sees León. A flashback reveals Inés' enigmatic connection to him, and Eric has another episode of amnesia, causing Elías to become suspicious of his unusual behavior.

After a student's death and another's disappearance, the students are suspected when ecstasy is discovered during a search conducted by the headmaster.

The friends mourn the death of Manuel, while Father Superior enforces disciplinary measures against Elías for violating his monastic vows. Elvira begins passing on her knowledge to others, and Inés starts piecing together clues about her past. A new and unexpected death provokes student anger, leading to a rebellion that plunges the school into chaos and culminates in an unforeseen outcome.

Jacinta's return offers a brief sense of relief to the community, but the optimism is short-lived as Elsa's leadership continues to generate unease. At the same time, Marcos begins to uncover a disturbing connection between the deceased orphans and the mystery surrounding his missing sister.

Elsa risks professional repercussions in her role as head mistress because she is unaware of the problems in Julia's personal life. At the same time, Fermin's efforts to hide a serious injury are endangering his life.

Marcos tries to have Héctor removed as guardian in an effort to shield himself and Paula from the school's influence. However, conflicting investigations into the matter leave him feeling isolated and uncertain about whom he can trust.

Manuela Portillo, Iván's cousin, sends him a surprising item—his death certificate—as a way to prove they are not related and can be together.

A missing person investigation leads police to the scene, where they discover the existence of a gnome, revealing it to the public for the first time. As tensions escalate, the episode examines whether the lesson of not judging by appearances can help avert a potential tragedy.

As Christmas approaches, most of the characters make plans to return home, leaving Marcos, Paula, and Miguel behind. A sudden snowstorm disrupts their travel arrangements, leading to unexpected revelations about loyalty and heroism within the group.

Paula becomes convinced that the gnome has been reincarnated after experiencing repeated visits from an owl. Meanwhile, Iván has difficulty accepting that he committed murder. Fermin encounters a life-threatening situation and loses his paintings, after which the group discovers a second door. Saúl, in the meantime, prepares a new operative.

Nora exhibits keen observational abilities that earn Héctor's admiration, while Fermín's forensic examination reveals that a nearly six-foot attacker shot an unnamed contact in a room where Maria was also present. Maria's behavior indicates a potential link to Iván.