Kate Miller, a sexually frustrated housewife, is being treated by her New York psychiatrist, Dr. Robert Elliott. After unsuccessfully trying to seduce Dr. Elliott, Kate visits the Metropolitan Museum of Art. In one of the museum’s galleries, Kate flirts with a mysterious stranger named Warren Lockman. She and Warren have sex in his apartment. Kate quietly leaves the apartment but notices she left her wedding ring in Warren’s apartment. She hurries back to retrieve it. When the elevator door opens, a tall blond woman with a straight razor slashes Kate to death. Liz Blake, a high-priced call girl, finds the body and gets a glimpse of the killer. Liz is  the killer’s next target and a prime suspect. Police detective Marino doubts Liz’s story partly because of her profession. Liz joins forces with Kate’s precocious teenage son, Peter, to find the killer. What they discover is both incredible and shocking.