Wanda, the Wicked Warden (1977)

A young woman feigns illness in order to infiltrate a mental hospital, where she investigates the disappearance of her sister, a former patient. Meanwhile, the hospital warden and her attendants abuse and torture their charges, forcing them to star in cheap skinflicks.

Directed by: Jesús Franco

Starring: Dyanne Thorne, Tania Busselier, Lina Romay, Eric Falk, Angela Ritschard, Howard Maurer

Links: IMDb, Movie posters, Movie stills