Gosh, this book pissed me off.
I can't tell if it's good or not, because on one hand there's a lot of good points to this book, but on the other, there are so many things off...
It feels like the author tried to put too much in one book (heck it's 1k pages long...), or too many details. Or both. I always wanted to put it down because it was circling around the point of the story without really touching it. Therefore, it felt incredibly long. I reached the end somehow... eventually, and I was so relieved about that, it made me feel guilty.
The characters development was odd too. Somehow, you get many details about the earlier life of some of them, but then again, it feels like you didn't get any insight in their life. As I kept going, I always felt that I only had a superficial image of them, that I didn't know anything about them. It may comes from the fact that there are a lot of characters, so you end up forgetting which details are about this or that character. Not only did the character lack depth, most of them weren't even slightly interesting...
I was also disappointed that we didn't get more about the psychology of serial killers, or killers im general. Before starting it, I really thought thr length of the book was coming from more details about how their brains work. And even as I was reading, I kept thinking it would because there are two main arcs which aren't really related to each other (okay, spoiler alert: they actually are but even if they weren't, it wouldn't change much to the story so who cares if there's a link?), so here I was thinking we get two stories because the (serial) killers have similar minds that would be described. It appears not, unfortunately. So no psychological details.
Ah well. Despite all that negativity, the story's still interesting. The POV change helps making the story surprise you when you least expect it. However, the end is the typical "happy ending" thing in which the bad guys die, and the princess/kid is saved because of too many coincidences. I mean, come on...
Also, one last thing. I don't know if it comes from the translation (I read a French translation) or if it's from the original style, but the writing style was... heavy(?). I always had to read some paragraphs again because I kept losing track of sentences. (And that's a pain in the ass.)