Thirteen by Steve Cavanagh is a legal thriller, courtroom drama, and murder mystery all rolled into an exceptionally clever story. The synopsis mentioned serial killers and I was invested. I have read a couple of serial killer stories and have enjoyed them a lot. All of them were thrillers and had the investigative angle to them. This one is not that different either. We follow two POVs one of an ex-con turned defense lawyer Eddie Flynn and the other of Kane, the serial killer.