Be warned: once you pick up this book you will not put it down! In this title, Ressler includes interviews with serial killers John Wayne Gacy and Jeffrey Dahmer, the best and last insights into the minds of mass murderers. He also sites his views on the infamous Jack the Ripper murders of 1888 and talks of his involvement in the Wimbledon Common and Coleherne Pub murders of the 1990s. If you only read one book on criminal profiling, make it one of Ressler's. His fluid style and amiable writing will keep you involved right until the last page. A masterpiece.