In a lonely and gloomy mansion in the Spanish countryside, a group of young students arrives to complete their education at a boarding school. The atmosphere is tense and heavy with unsettling secrets as the new pupils adapt to life in this strict educational institution, run by an authoritarian figure who does not tolerate indiscipline. However, they soon realize that the place is darker than it seems.
As the relationships among the students deepen, strange occurrences begin to emerge: inexplicable noises, shadows gliding through the hallways, and even whispers that seem to come from the walls themselves. The curiosity of a group of students leads them to delve into the history of the residence and uncover the sinister past of the school, filled with mystery and tragedy.
As the tension intensifies and events become more dramatic, a chilling secret is revealed, linked to the disappearance of several students years ago. Paranoia takes hold of the young individuals, and each begins to question the loyalty of the others. In this game of survival and distrust, friendship is put to the test, and every decision has fatal consequences. The line between reality and madness blurs in a terrifying climax that will reveal that some places, harboring horror within, should never be inhabited.