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. Nothing in the film, however, is as tasteless as its original ad campaign, which played up its similarity to the crimes of Chicago mass-murderer Richard Speck (who actually killed student nurses and not patients).