The backgrounds of some serial killers and how these elusive persons are tracked is documented in this text. Inset boxes "What Makes a Serial Killer," "Step by Step Creating a Criminal Profile," "Childhood Influences" and "On the Job: Becoming a Profiler" provide brief lists for the reader who may do additional research to confirm and add further information. While the accuracy and assistance of technologies to apprehend these killers is shown, the fallacies also are noted.