Nestled deep in an isolated, foreboding Northern Spanish forest next to an ancient monastery, Las Cumbres is a strict boarding school designed for rebellious and troubled youths. Run with iron discipline by its enigmatic director, Mara, the institution operates under a shadowy regime where students are subjected to brutal punishments.The narrative ignites when Amaia, a fierce and fiercely independent student, attempts a daring midnight escape through the dense, perilous woods alongside her boyfriend, Manuel. However, their bid for freedom is brutally cut short. Manuel is abducted by a mysterious masked figure wearing a crow-like beak mask, while Amaia is recaptured and dragged back to the school. Desperate to find her missing friend, Amaia enlists the help of a cynical newcomer, Paul, along with their peers Paz, Eric, and Julio.As the teenagers dig into the school’s dark underbelly, they unearth terrifying secrets. They discover that Las Cumbres is not merely a correctional facility, but a front for a secret medical sect that performs horrific human experiments on students. This sinister cult is searching for a cure for a terminal disease, tracing its roots back to a nest of Nazi war criminals who once hid in the monastery. The children realize that the school's faculty, including art teacher Elvira and dormitory supervisor León, are deeply entangled in the conspiracy, with some acting as victims and others as complicit jailers.Simultaneously, Inspector Ramos investigates the disappearances, colliding with the school's heavily guarded secrets. As the web of deceit tightens, loyalties are tested, and paranoia sets in. Friendships fracture under the unbearable
psychological pressure, and characters are forced to make life-or-death decisions.The tension escalates toward a chaotic, bloody climax. Manuel is revealed to be alive, trapped in the subterranean laboratory beneath the school, serving as a test subject for the cult's depraved procedures. Amaia and her friends launch a desperate
rescue mission, leading to a fiery confrontation that exposes the facility's atrocities to the outside world. Yet, as the dust settles, the shocking realization dawns that the conspiracy runs far deeper than they ever imagined, leaving the survivors trapped in an inescapable web where no one can be trusted, and the true mastermind remains hidden in the shadows, pulling the strings of their torment.