The Boston Strangler. The Son of Sam. Jeffrey Dahmer. Every time a serial killer hits, it touches a deep collective nerve of fear--in part because their grisly acts so defy comprehension. Or do they? Step behind the scenes at the FBI's Investigative Support Unit, where psychological detectives race against time to penetrate the minds and emotions of the most elusive of murderers. Using state-of-the-art science, elite investigators tear apart crime scene evidence and scrutinize victim profiles to construct an astonishingly accurate personality print of the perpetrator--and a good guess as to how and when he'll make his next move. Narrated by Patrick Stewart.