Kenneth Bianchi, one of the two serial rapists and killers who terrorized the Los Angeles area in the late 1970s, is giving police station interviews to psychiatrist Samantha Stone, who has disquieting lifestyle issues of her own. It falls to her to delve into the details of the case to determine the veracity of Bianchi's claims of multiple personality disorder, but in so doing, she is forced to relive the horrific crimes, one of which occurs at her very doorstep.
