By far, the most twisted book in this series.
You know from the get go who the bad guy is and boy do you want the cops to get him. He's sick and twisted and ... Ugh he was just bad.
There there was the second case in the story that you couldn't get a read on until it was coming to an end and you were almost glad to see it end the way it did.
Very very good 9th book in a series.