A reporter and a blind retired journalist try to solve a series of murders. The crimes are connected to experiments by a pharmaceutical company in secret research. The two end up becoming targets of the killer.
Genre: Horror, Mystery, Thriller
Cast: James Franciscus, Karl Malden, Catherine Spaak, Pier Paolo Capponi, Horst Frank
Producer: Ennio Morricone, Dario Argento, Dario Argento, Dario Argento, Dardano Sacchetti
IMDb Score: 6.7/10 by 188 users
Runtime: 112 minutes
Released: 2/12/1971