Depraved Heart

Twenty-two years in the FBI, sixteen of them as a member of the Bureau's Behavioral Science Unit. Thousands of homicides, rapes, suicides, and other gruesome crimes. Roy Hazelwood, like many investigators, has seen it all. But unlike most, he's gone further — into the dark and twisted psyches of serial killers and sadistic sexual offenders — and has emerged as one of the world's foremost experts on the sexual criminal.