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A regular Spanish school, where nine teachers have died in mysterious circumstances one after another, has caused panic among the staff, and the school is on the verge of closing. At this critical moment, the struggling young teacher Modesto (played by Raúl Arévalo) comes to apply for a job. He has the ability to see ghosts, but no one believes him. He is diagnosed by doctors as having mental illness and delusions. The students mock and ridicule him, and the principal is angry and frustrated, leading to Modesto not staying long in any school. On his first day at the new school, Modesto accidentally discovers the spirits of five students who have been haunting the school. These students were punished for breaking school rules 20 years ago and died in an accidental fire. For years, these five ghosts have been mischievous and have scared both teachers and students. At the request of his beautiful female colleague, Modesto decides to face everything and help these five children find peace...