Although I haven't read any of the other books in the Karen Vail series I throughly enjoyed this book. Karen Vail is an FBI agent working with BAU when a serial killer she helped incarcerate escapes and is threatening to kill the daughter that helped put him in jail. A manhunt ensues but another investigation. Into a string of arsons throws up links to the original murder investigation that makes Karen look at the whole case from the beginning. Did the right person get convicted the first time? Really enjoyable story, interesting.characters and I will look for the other books in the series now