Sometimes a killer isn't content to just kill. Sometimes he needs to quench his all-consuming thirst for sexual arousal by torturing his victims. In such cases, the victim's reaction to fear, pain and degradation works the killer up to a frenzy. So aroused is the killer that he doesn't want to let it end, and so he keeps the victim alive so that he can repeat and repeat and repeat the torture. Jay Greenwich profiles 45 of some of the world's most evil murderers - those who driven by the need to make their victims to suffer before they die, who leave their mark on their victims in the form of knife wounds, ligature marks and acid burns. These sadistic monsters are the modern-day bogeymen. They are the Torture Killers.