Haha, oops, I accidentally read this all in one afternoon? 
 I mean, if that's not enough of a ringing endorsement, what else do you want from me? The worldbuilding is top notch and I loved every second of it. I wasn't sure how much I was going to love the first person narrative, but Alina grew on me. 
 Sometimes I find I have a hard time really getting connected to YA books... for whatever reason. But this one pulled me in. I was frightened and creeped out in the Fold. I felt Alina's longing. (view spoiler)[Both for Mal and the Darkling. Ooh, Mr. Darkling, ooh. Seriously swooning. (I need a Kate Beaton parody comic asap.) And him ending up as the villain was perfection. (hide spoiler)] I got teary and over emotional. ... All in one afternoon! 
 That said, not a perfect book. But it's flaws can be brushed aside in light (haha, see what I did there) of everything else that it does so right. Did I mention the worldbuilding? Swoon.