I often think there is something wrong with me that I enjoy reading novels about serial killers! I too read and absolutely loved American Devil, I really didn't want it to finish and once ended wanted to re read all over again! I am currently reading Oliver Starks 2nd novel 88 Killer, which too is good, but I preferred his debut. I have ordered The Night Stalker, due to your recommendation Runner, can't wait to give that one a go! American Psycho is on the bookshelf waiting to be read still!