Unman, Wittering and Zigo

In this chilling 1971 British thriller, new schoolteacher John Ebony begins to suspect that his predecessor was brutally murdered by the pupils, and he becomes determined to prevent a similar fate from befalling him. Set in a real Cornish school, the film masterfully crafts an atmosphere of tension and suspense as Ebony's paranoia is fueled by eerie hints of darkness lurking beneath the surface of his unsuspecting students.