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Basic Instinct
In San Francisco, a blonde woman ties retired rock star Johnny Boz to a bed with a silk scarf during sex, then stabs him to death with an ice pick. SFPD Detective Nick Curran and his partner, Gus Moran, investigate the murder. The prime suspect is Boz's girlfriend, crime novelist Catherine Tramell, whose latest novel mirrors the details of the killing.
Catherine is uncooperative with the investigators, taunting them by smoking during questioning and exposing herself. Though released for lack of evidence, she becomes a person of interest when Nick learns that she has a history of close relationships with violent individuals. These include her girlfriend Roxanne "Roxy" Hardy, who killed her younger brothers as a teenager, and Hazel Dobkins, a convicted family murderer.
Nick, a recovering alcoholic with a history of drug abuse and a prior incident in which he accidentally shot two tourists, attends mandatory counseling with police psychologist Dr. Elizabeth Garner, with whom he has an unstable romantic relationship. He discovers that Catherine is using him as the inspiration for a new character—a detective who is murdered after falling for the wrong woman. When Nick suspects that his confidential psychiatric file has been leaked, he assaults internal affairs lieutenant Marty Nilsen, who had access to the file. Nilsen is later found murdered and Nick is placed on administrative leave.
At Boz's nightclub, Nick sees Catherine and Roxy using cocaine. Later, at Catherine's home, she ties Nick to the bed during sex while Roxy watches. Moran expresses concern about Nick's involvement with Catherine and uncovers that Nilsen received a $50,000 payment months before Nick met her.
Roxy attempts to kill Nick in a car attack but dies in the ensuing crash. Catherine reveals that she had an intense relationship with a woman in college who became obsessed with her. Nick suspects the woman was Garner, who claims the obsession went the other way. Investigating further, Nick finds that Nilsen had withdrawn a complaint Catherine filed against Garner years earlier. He also uncovers that a professor shared by Garner and Catherine was killed with an ice pick in an unsolved case resembling Catherine's fiction, and that Garner's former husband was murdered in another unresolved case investigated by Nilsen.
Nick finds the draft of Catherine's new novel, which depicts a detective discovering his partner's body in an elevator. Catherine abruptly ends their relationship. Later, Moran tells Nick he has arranged to meet Catherine's former college roommate in Oakland to learn more about her and Garner. When Nick arrives, he finds Moran stabbed to death with an ice pick in an elevator, mirroring the novel. Garner arrives shortly afterward, claiming she was lured there by a message. Believing she is reaching for a weapon, Nick shoots and kills her but she is found to be unarmed.
Police find evidence in Garner's apartment implicating her in multiple murders, including files and photographs related to Catherine. Nick is left confused and emotionally shaken. Later, Catherine returns to Nick's apartment and they have sex. As they lie in bed discussing their future, an ice pick lies unseen beneath the bed.