Serial Killers

The introduction at the beginning of the book is informative and interesting, not many books have a introduction that mentions real-life FBI agents like Robert Ressler or John Douglas. Both are significant FBI agents that have had interesting careers. Robert Ressler was one of the FBI agents responsible to Ted Bundy being caught. John Douglas work with the FBI in the Behavioural Science unit that created “psychological profiling” of serial killers, to categorise the characteristics, mindset, personality of serial killers. If psychological, geographical or other forms of profiling never existed, then a lot of serial killers would have not ever been discovered, so Israel Keyes (an Alaskan serial killer and someone that terrified the FBI when he was questioned about his crimes would never have been known about or caught. That is terrifying!)
Profiling is absolutely necessary to discovering a serial killer, murderers, terrorists etc..
It is not a exact science though, and a psychological profile of a serial killer, or potential murderer, mass murderer can be wrong, inaccurate.

Jack the Ripper has always interested me, but some aspects of the information available about the murders can be false, a hoax for attention or inaccurate. If Aaron Kosminski's brother Wolf, was a Jack the Ripper suspect then why was he never questioned about the murders? Why is there no information about him in the book? It's a bit frustrating, as a reader of true crime.