Patients and those working in an isolated mental hospitals are murdered, one by one, by a madman lurking in the corridors
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Verdict: Unknown
> Elio Scardamaglia (Director)
> Lionello De Felice (Director)
> Marcello Masciocchi (Director of Photography)
> Roberto Pariante (Assistant Director)
> Luciano Martino (Screenplay)
> Ernesto Gastaldi (Screenplay)
> Robert Williams (Novel)
> Ernesto Gastaldi (Story)