Franco Arnò (Karl Malden), a middle-aged blind man, is walking down a street at night with his niece Lori (Cinzia De Carolis) when he overhears a man in a car mention blackmail. They walk back to Franco's apartment and Lori sleeps. Outside, the man in the parked car gets out and breaks into a large medical complex, the Terzi Institute. Franco shows Carlo a note he received in which the killer threatens them. Carlo tells Franco he