Plot: In Rome, Police Inspector Manetti assigns detective Anna Manni to travel to Florence to investigate and track down a rapist serial-killer to understand why he did not kill his three victims from Florence. However Anna suffers from "Stendhal's Syndrome" and she faints in a museum while watching the paintings and the killer lures and rapes her. The disturbed Anna changes her behavior and has sessions with the psychiatrist Dr. Cavanna that suggests that she should spend a couple of days with her family in the countryside. However the maniac is obsessed with her and she stays under the protection of Detective Marco Longhi, who has feelings for her, and his team. But soon the serial-killer abducts Anna, ties her to a mattress and rapes her again in an isolated cave used by junkies. Anna learns that his name is Alfredo Grossi and she succeeds to release; when Alfredo returns, she shots him in the stomach and blinds one of his eyes. Then she drops his moribund body in a waterfall. However the police does not find the corpse. Anna has the feeling that Alfred is alive, and when there is another victim, she is sure that he has not died.
Alternative Plot: A police detective falls under hallucinatory spells while trying to capture the sadistic man who raped her.
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