This book took forever for me to finish -- I hardly have any time to read anymore (or well, I do, but I'm too lazy to make time). Anyway, I very much enjoyed this book! It was incredibly dark, and I can't tell if it frustrated me or interested me. I was frustrated at the fact that Adelina keeps pushing away every single positive force in her life, but at the same time it very much fascinated me. I've never really read a book where the protagonist goes on a constant downwards spiral -- to see Adelina just go deeper and deeper into madness is incredibly interesting. The concept of this book is actually very unique -- I'd like to applaud Marie Lu for writing such a wonderful series about a protagonist that turns into a villain. It's unlike anything I've really read before, and I love it! It's very refreshing to read a book that doesn't follow the normal "protagonist hero" equation. 
 I did have a few issues with the book (the constant mentioning of the "whispers" in Adelina's head kinda irked me -- whenever someone mentions "whispers" in their head, all I can see is someone trying to look edgy. I don't know if that's just me, though). But, my issues with this book aren't too important, so I'm just going to say that I liked it a lot. I'm definitely going to read the next book in the series, and I would definitely recommend this book if you want to read something thats very unique and dark!