Plot: While taking a shower, Kate Miller, a middle-aged, sexually frustrated New York City housewife, has a rape fantasy while her husband stands at the sink shaving. Later that day, after complaining to her psychiatrist Dr. Robert Elliott about her husband's pathetic performance in bed, she meets a strange man at a museum and returns to his apartment where they continue an adulterous encounter that began in the taxicab. Before she leaves his apartment, she finds papers which certify that the man has a venereal disease. Panicked, Kate rushes into the elevator, but has to return to his apartment when she realizes she's forgotten her wedding ring. When the elevator doors open, she's brutally slashed to death by a tall blonde woman wearing dark sunglasses. Liz Blake, a high-class call girl, is the only witness to the murder and she becomes the prime suspect and the murderer's next target. Liz is rescued from being killed by Kate's son Peter, who enlists the help of Liz to catch his mother's killer as Detective Marino, who's in charge of the case, is uncooperative in the investigation.
Alternative Plot: When Liz Blake (Nancy Allen), a prostitute, sees a mysterious woman brutally slay homemaker Kate Miller (Angie Dickinson), she finds herself trapped in a dangerous situation. While the police think Liz is the murderer, the real killer wants to silence the crime's only witness. Only Kate's inventor son, Peter (Keith Gordon), believes Liz. Peter and Liz team up to find the real culprit, who has an unexpected means of hiding her identity and an even more surprising motivation to kill.
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