Nurse Charlotte Beale arrives for a new job, only to discover Dr. Stephens has been killed by an axe-wielding patient.
Despite the title’s warning, the basement holds a final gruesome secret: the original Dr. Stephens is still alive down there, though severely wounded. Key Characters & Performances The film is noted for its "eccentric" ensemble of patients: Don't Look in the Basement
The new administrator, Dr. Geraldine Masters, reluctantly hires Charlotte but maintains a tyrannical and suspicious grip on the facility. Nurse Charlotte Beale arrives for a new job,
As the patients’ behavior becomes more violent and erratic, it is eventually revealed that Dr. Masters is actually a patient herself, playing the role of a doctor after the original staff were killed. Stephens is still alive down there, though severely wounded
The film is set at Stephens Sanitarium, an isolated mental institute where the chief doctor, Dr. Stephens, believes the best therapy is for patients to freely act out their delusions.