Fernando DiLeo, best known for a series of westerns and crime films, tried his hand at horror with this extremely sick little item loaded with nudity and violence. Set at a remote mental institution (inexplicably located in a castle), the film features Klaus Kinski as a doctor whose mostly female patients are being brutally dispatched by a psychopath. Margaret Lee and Rosalba Neri are among the frequently unclothed cast, and there are decapitations, crossbow bolts in the eye, and - in some foreign prints- fairly explicit sex.