The science of personality theory has advanced dramatically in recent years clearing the way for this useful and edifying speculation about the inner workings of horrific serial killers. Applying personality theory to more than a dozen of the most notorious serial killers in modern history, the mystery surrounding their crimes begins to unravel. What drives them to commit horrific crimes? How does sexual desire fit into their motivation? Why do some stop killing while others escalate? What are the different types of serial killers based on personality theory? Contains mature themes.