A woman finds herself trapped in a bathroom stall by a man whose intentions are not entirely clear.

England, 1969. The fascinating Abbie and the troubled Lydia are great friends. After an unexpected tragedy occurs in the strict girls' school they attend, a mysterious epidemic of fainting breaks out that threatens the mental sanity and beliefs of the tormented people involved, both teachers and students.

A young teacher takes a job at an unusual private school where she soon discovers that the boys have a sinister power over the girls. As the boys behaviour becomes increasingly threatening she uncovers the source of the girls fear; an ominous locked door at the back of the classroom.