It starts when Sharon McCone's acquaintance tells her that someone was pretending to be McCone at a party. The mysterious woman is handing out McCone's business cards, advising clients, and picking up men for intimate encounters. The woman's physical resemblance is uncanny. Her knowledge of McCone's life is chilling.
To make matters worse, McCone's office manager, Ted Smalley, has been acting oddly. As she reluctantly decides to investigate Ted's behavior, McCone's double breaks into her house, interferes with her family, and leads McCone in a terrifying game of cat and mouse through the bizarre nightlife of San Francisco. McCone begins to uncover Ted's desperate problem, but the imposter escalates her dirty tricks. The determined PI must pull out all the stops to defeat the criminal hitting too close to home.