An in-depth study examining just what drives men to kill. Illustrated with fascinating real-life murder cases, this title probes the psychological reasons why they happen. Some say there is a bit of sado-masochism in everyone, so are sexual killers actually responsible for the crime they commit? Here are all the answers, chronicled in a fascinating voyage through the dark inner regions of the mind and brought vividly to life with case histories drawn from all over the world.