Two iconic cases of criminal profiling with agents Robert Ressler and Russ Vorpagel. In California, the terrifying case of Richard Trenton Chase (The Vampire Killer) who attacked indiscriminately, leaving chaotic scenes and drinking the blood of his victims. The FBI creates a profile of a schizophrenic and disorganized subject. Then, the case of James Mitchell DeBardeleben, a highly organized counterfeiter, rapist, and torturer. The trail of counterfeit bills and his incriminating photographs, along with Peter Merck’s mole analysis, convict him. The episode also reviews John Wayne Gacy’s method.