Horrormeister Dario Argento establishes his durable and elegant pattern in his first feature: a witness to a crime knows more than he knows he knows. How and when will his subconscious cough it up? More of an atmosphere, more of an air of mystery, less of a blood bath, than in later Argentos. One terrifically nightmarish episode of a distressed damsel cowering behind a locked door through which an anonymous knife-wielder is methodically carving a hole. Tony Musante, Suzy Kendall, Eva Renzi. (1970) — Duncan Shepherd
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