First of all, while the whole serial-killer toying with the police is not my favourite trope, in this book it works and makes sense, considering what are the killers goals and motivations.
The book was a pretty good read, though with the three lines we were following there wasn't really that much of the investigation. Some actions were taken, yes, but then it got abruptly cut off as the killer moved to his endgame. Too many story arcs led nowhere and while I know there have to be red herrings, it was a bit grating. And while I didn't like this switch happening so fast, it was a nice surprise that even though (as in all books of this type) the killer was almost supernatural, knowing everything and being everywhere at the same time, it has been made clear that he had to abandon some plans and improvise in other places.
While the ending felt to abrupt for me, I really liked the final twist. Oh, and all the characters are waaaaay too obsessed about sex. I wonder if the other volumes are like that as well?
I'll need to check them out... one day.