Writers: Dario Argento, Luigi Cozzi, Dardano Sacchetti
Release date: 26 May 1971
Countries: Italy, France, West Germany
Languages: English, Italian
Runtime: 112 min
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Storyline: Franco Arno is a blind man that lives with his young niece and makes a living writing crossword puzzles. One night, while walking on the street, he overhears a weird conversation between two man sitting in a car parked in front of a medical institute where genetic experiments are performed. The same night someone breaks in the institute and knocks out a guard. Arno decides to investigate with the help of reporter Carlo Giordani.