This was a very interesting book, but I don't think that much of the author's theory. She believes a genetic, neurological problem causes serial murder and environment, upbringing, etc., has nothing to do with it. In order to get her theory to work she used a very narrow, arbitrary definition of a serial killer. If Ed Gein was a serial killer, why wasn't Elizabeth Bathory? This book is good to read for all the information it contains about certain serial murderers, including some relatively obscure ones, but I don't think it's the answer to everything. ( )