Angie Dickinson stars as Kate Miller, a housewife so unsatisfied sexually that she often finds herself having vivid and wild sexual fantasies, with violent overtones. She has been seeing a psychiatrist, Dr. Elliott (Michael Caine), about her marital problems, and even makes a pass at him, although nothing comes to pass. Unable to resist the temptation, Kate has an afternoon fling with a complete stranger, only to end up the victim of a brutal and senseless slaying at the hands of a mysterious figure with a straight-edge razor. Only one person witnessed the murder, a spunky prostitute named Liz (Nancy Allen), who describes the perpetrator as a blonde woman in sunglasses. Meanwhile, Dr. Elliott begins receiving phone calls from one of his patients, Bobbi, a pre-op transsexual with homicidal tendencies, and Dr. Elliott’s stolen razor.