4They say your school days are the best of your life, but not so for the Doctor and Clara. They have come to investigate a series of mysterious disappearances at an elite school, Clara's friend Cristel among them. But this is no ordinary educational institute; sinister forces are at work, manipulating students, and causing teachers and community members to disappear. Will they really able to uncover what is causing this terrifying case, and save the school and the world?