Along with Robert Ressler and John Douglas, Roy Hazelwood is one of the founders of VICAP, the FBI program that profiles serial killers. Hazelwood's specialty, is sexual crime -- sexually motivated serial killers to rapists to the frightening psychology that drives sexual sadists to the bizarre scenarios behind autoerotic deaths. Hazelwood consulted on the notorious "Barbie and Ken" case, the Atlanta child murderer, and the explosion aboard the USS Iowa. This is a fascinating look at the human dark side from an expert on the subject.