Early Dario Argento thriller. Karl Malden plays a former newsman, Franco Arno, who has been blinded in an accident, but his thirst for solving puzzles has never been quelled. He overhears a blackmail plot and teams up with an investigative journalist to uncover the truth behind a sinister chain of grisly murders, but that old cat-killer, curiosity, may be the pair's eventual downfall.
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