Roy Hazelwood and his book . . . Dark Dreams.

If you truely have a desire to understand the madness of sex morphing into death this is a must read. Scary as anything out there . . . but as they say, the truth trumpets non-fiction everytime. I studied under the auspices of Mr Roy Hazelwood and a community I policed in, benefited immensely. I had the honor of tracking down a serial rapist.