The validity of Ressler's information is automatically questionable considering he seems to use this book as a way to get back at his former colleagues with the BSU. I found myself laughing at times when he gives himself considerable amounts of credit for progress in a case or his repeated claim of coining the term "serial killer". This inflated sense of self takes away from all the information that the book provides. The interviews with Gacy and Dahmer are interesting. However, I wonder how accurate they are because Ressler seems so concerned about looking smart and good at what he does. It is apparent that he has something against John Douglas, who is the guy you should be reading anyway.