" R. M. Holmes and J. DeBurger divide serial killers into four varieties, based on their underlying motivations: visionary types (psychotics who hear voices or see visions commanding them to kill); mission-oriented types (generally prostitute killers who believe they are on a crusade to rid the world of scum); hedonistic types (lust-killers who murder for perverted pleasure); and control-oriented types (who derive their sick gratification less from sex than from the assertion of power and dominance over the victim). "

― Harold Schechter , The Serial Killer Files: The Who, What, Where, How, and Why of the World's Most Terrifying Murderers