When we think of the word "criminology", we immediately think of serial killers. Literature, films and TV series have accustomed us to the image of the investigating criminologist who investigates heinous crimes committed by a highly intelligent psychopath. But the criminologist is not only concerned with this; he is also called for cases bearing an esoteric trace: the satanic murders. Here then the criminologist must provide answers to several questions: who are the Satanists? What drives them to worship the Devil? Are ritual sacrifices real? In this book we will try to provide an answer to these questions. Because, as Shakespeare wrote: "Hell is empty, and all the devils are here."