Six schoolgirls in their early teens are confined to a sinister boarding school where they are intimidated and often abused by the Nuns in charge. The school's most dreaded Nun discovers one of the girls is pregnant and delivers a cruel and brutal beating. Witnessing their classmate's torture the girls rush to her aid. The following day the Nun is found dead. Years later one of the girls is brutally assassinated... then another. The remaining join forces, knowing that the Nun has returned and is seeking revenge... they must now confront their terrible secret.