Il gatto a nove code (Cat o' Nine Tails)
The killer is Dr. Casoni (Aldo Reggiani), who was the one who broke into the pharmacy lab to steal a vital scientific formula and then betrayed and killed his acomplice and anyone else associated with the project. In the rooftop confrontation, the blind Franco Arno (Karl Malden) gets the upper hand, and and kills Casoni by throwing him down an elevator shaft after mistakently thinking that Casoni murdered his young niece.
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