What makes people kill? Specifically, what are the motivations behind serial, mass, and spree killings?Drawing from cases such as the mass murder in Dunblane, Scotland, in which a lone gunman mowed down 16 children and their teacher, the still-unsolved Tylenol poisonings, and the Unabomber, former FBI profiler John Douglas and coauthor Mark Olshaker try to explain the unthinkable.What sets The Anatomy of Motive apart from so many of the theories about these horrific acts of violence is that Douglas and Olshaker have no obvious political agenda. They don't look for easy answers and they don't provide easy solutions. They do, however, offer some insight into the twisted kind of thinking that can lead a person to believe that the solution to his problems lies in bloodshed. They also provide some danger signs that may help to identify the potentially violent criminal before he has a chance to act out his morbid fantasies.While The Anatomy of Motive is undeniably horrifying, it is also illuminating, and Douglas and Olshaker approach their topic with grace and insight.