Christopher Berry-Dee is the man who talks to serial killers. A world-renowned investigative criminologist, he has gained the trust of murderers across the world, entered their high security prisons, and discussed in detail their shocking crimes. Berry-Dee now delves into the mind of perhaps the most sadistic and psychopathic killer of all time. Between 1978 and 1991, Jeffrey Dahmer murdered and dismembered seventeen boys and...