In an inaccessible place between the mountains and isolated from the world, a school is located next to an old monastery. The students are rebellious and problematic young people who live under the strict and severe discipline imposed by the center to reintegrate them into society. The surrounding forest is home to ancient legends, threats that are still valid and that will immerse them in terrifying adventures.

Years ago, a cruel and merciless nun turned boarding school into a living hell for her students until they could no longer bear the abuse, and she mysteriously disappeared. Now the alumnae are being brutally murdered one by one.