Profiler Roy Hazelwood is the world's leading expert on the strangest, most dangerous of all aberrant offenders - the sexual criminal. In a career spent investigating and studying these macabre outlaws, Hazelwood has encountered every type, from sexual sadists to serial rapists. His cases have ranged from autoerotic deaths to staged suicides, and have included famous investigations from Toronto's notorious "Ken and Barbie" sexual killings to the Atlanta Child Murders and the fatal explosion that killed forty-seven sailors aboard the USS Iowa.