A middle-aged housewife, Kate Miller, feels unfulfilled in her sexually stagnant marriage and discusses her fantasies and dissatisfactions with her psychiatrist, Dr. Robert Elliott. After an encounter at a museum leads Kate to have a brief affair with a mysterious stranger, she unwittingly becomes the target of a brutal crime that leaves her murdered. Her son, Peter, a genius-level tech whiz, is left to grapple with the sudden loss of his mother.

Liz Blake, a high-end call girl who witnesses the aftermath of Kate's demise, becomes both the prime suspect and the next potential victim. The only person who seems to take her account seriously is Kate's son Peter, who teams up with her in an attempt to solve the murder. As Peter and Liz delve deeper into the mystery, they find themselves entangled in a perilous web involving Dr. Elliott's troubled patients and a series of chilling events that threaten their safety. Together, they race against time to untangle the truth before the murderer strikes again.