Kate Miller showers while her husband shaves. Suddenly, a figure appears behind Kate, puts a hand on her mouth and gropes her body. Kate screams out as the man rapes her, but, as it turns out, this is Kate’s fantasy. In reality, Kate and her husband, Mike, are having sex in their bed while morning radio plays. Afterwards, Kate talks with her son Peter downstairs as he works to build a computer for the city science championships. Kate then leaves for an appointment with psychiatrist Robert Elliott. Kate complains about sex with her husband and asks if Elliott finds her attractive. He says he does, but that he would never act on his desire, at the risk of jeopardizing his job and his marriage. Later, Kate looks at paintings in a museum. While she sits on a bench and makes notes in her date book, a man sits beside her. Kate takes the glove off her left hand to reveal her wedding ring, thus sending the man away. Kate drops her glove as she gets up to follow him, and the two flirtatiously pursue each other throughout the museum. When she seems to have lost him, the man comes from behind and places his hand on her shoulder, wearing the dropped glove. This frightens Kate away, but when she realizes it was her glove on his hand, Kate tries to catch up with him. Outside, Kate has all but given up. Then she sees the man’s hand, playfully dangling her glove from a cab window. Kate approaches to apologize for acting rudely, but he pulls her into the backseat for a passionate kiss. In the early evening, she wakes up naked in the man’s apartment and dresses to leave, careful not to wake him. After writing a goodbye note, Kate spies a medical document in the man’s desk drawer stating that he has contracted venereal diseases. In a panic, Kate flees the apartment. As she waits for the elevator, a blonde-haired woman watches from the stairway. On the way down, Kate realizes that she left her wedding ring and must go back up. Kate arrives back at the seventh floor, but the blonde from the stairwell appears and enters the elevator. Wielding a straight razor, the woman brutally attacks Kate. On another floor of the building, a call girl, Liz Blake, awaits the elevator with her client, Ted. When the elevator arrives, Ted looks inside after the doors open then runs away. Liz discovers Kate on the elevator floor, struggling and covered in blood. Kate reaches out for help, but before Liz can take her hand, she sees the blonde woman’s reflection in the elevator mirror. Just as the door shuts, the blonde drops the razor and Liz grabs it. A cleaning woman in the hallway sees Liz holding the bloody razor and screams. Later, Dr. Elliott receives a phone message from Bobbi, a transsexual patient who claims to have committed a murder with Elliott’s razor. He also acknowledges that a woman saw him do it. Bobbi asks Elliott to confirm to his new psychiatrist, Dr. Levy, that he is “okay,” so that Levy will sign off on Bobbi’s sex change; otherwise, Bobbi threatens to be a “bad girl again.” Elliott also reviews a message from Detective Marino, who requests he come to the police station to answer questions regarding Kate’s murder. At the station, where Liz also gives testimony, Elliott offers his assistance to Kate’s son Peter as they wait outside Marino’s office. While Marino questions Elliott inside, Peter eavesdrops. Marino shares the few details he knows, but Elliott is reluctant to divulge patient information. Later, Marino tells Liz that she is a suspect. He gives Liz two days to produce Ted, the only other witness to the murder who has since left town; otherwise, Marino will arrest Liz. The escort service later informs Liz that Ted will not return for two weeks. Outside Elliott’s office, Peter records the amount of time it takes for patients to exit Elliott’s door and reach the street. With this information, Peter sets up a camera to take intermittent photographs of patients as they enter and leave. In the evening, Bobbi waits outside of Liz’s apartment. In her apartment, Liz arranges a date with a client over the phone while Bobbi spies on her from the street. At his office, Elliott listens to another message from Bobbi, who plans to kill Liz. As Liz prepares for work, she watches a televised interview by TV host Phil Donahue with a transsexual, while Elliott watches the same program in his office. After leaving her client’s hotel room, Liz notices Bobbi following her and attempts to escape, on foot and in a cab. Back at his office, Elliott calls a nearby mental hospital and requests to speak with Bobbi. Once Liz’s cab drops her off, she heads toward the subway, and the cab driver notices Bobbi pursuing her. As Bobbi walks up, the cab driver quickly opens his car door and strikes him, sending him to the ground. Later, as Liz emerges from a different subway stop, she finds Bobbi waiting for her on the street. Liz runs back into the subway, where she is accosted by a group of men on the platform. Liz manages to get on the train, but the men eventually catch up. Liz finds herself trapped between subway cars with the razor-wielding Bobbi. Peter appears and sprays mace in Bobbi’s face. Blinded, Bobbi flees. Back at her apartment, Liz thanks Peter, who reveals that he had been following Bobbi since “she” left Elliott’s office that day. The two decide to seek out Elliott’s appointment book in order to identify Bobbi. Before doing so illegally, Liz asks for Detective Marino’s help. He informs her that he cannot go into the office without a search warrant, but hints that she could under the guise of being a paranoid murder suspect. Then, Marino reminds Liz that he plans to charge her tomorrow. Elliott visits the mental hospital and speaks with Dr. Levy, expressing his fear that Bobbi is using his razor to commit murders because Elliott would not approve a sex change. Later, Peter watches outside Elliott’s office with binoculars, as Liz attempts to seduce Elliott during an evening appointment. Liz undresses to reveal her lingerie and instructs Elliott to take off his clothes. She steps into the other room to secure Bobbi’s contact information. Meanwhile, someone grabs Peter and shoves him to the ground. Liz returns to Elliott’s office, where the lights have been turned off. She sees Peter banging at the window with his attacker behind him. Behind Liz, Elliott, now dressed as Bobbi, assails her with the razor. Outside, Peter’s attacker pulls out a gun and shoots into the office, hitting Elliott just before he can kill Liz. At the police station, Marino tells Liz that she had been followed by a female officer, the one who ultimately shot Elliott. Also at the station is Dr. Levy, who explains that Elliott is a transsexual who, when aroused, takes on the persona of Bobbi and attacks the person who aroused him, first Kate, and then Liz. Later, at a restaurant, Liz tells Peter that Elliott will be sent to Bellevue after he has recovered from his wound, and will only be tried if he is deemed sufficiently sane. With Mike out of town, Peter invites Liz to stay at his house. At a hospital that evening, Elliott kills the nurse tending to him and steals her clothes. Outside of Peter’s house, Elliott stalks around. Inside, Liz showers. When she notices Elliott’s feet near the bathroom door, she quietly gets out of the shower. Before Liz can grab a razor from the cabinet, Elliott, as Bobbi in the nurse’s outfit, attacks her. Liz jolts awake in bed and cries hysterically. Peter comes and comforts her. It was a dream.