I've actually finished this for a very long time now, and am currently reading another book. This is why my review might be a bit too foggy. 
 This was a vampire setting that was as realistic as it gets. Sure, it was still sugar-coated, being a Young Adult novel and all, but humanity (in the novel)'s reaction to the situation seemed pretty accurate. I wasn't so sure about the whole Coldtown thing, and the name Coldtown itself, but it all surprisingly worked out pretty well, and I commend Holly Black for it. 
 It was a book that wasn't too predictable at times, even though you kind of knew deep inside that the protagonist would get into a Coldtown. I guess what I'm trying to say is that it made you reel. I'm not actually sure, though, if it made you reel for more or reel from fear of something bad actually happening (which it didn't, by the way). The twist was unexpected, though. And I especially liked the ending.