This book is TENSE. Especially during the middle... everytime I stopped reading I found myself more anxious than when I started. 
I honestly struggled to decide what rating to give this book, the beggining was really slow, but I think it was necesarry to build up everything that happens later, it also fits with the way Hava sees and interacts with the world. I think the way it's narrated really differs from the other books of the saga, which is really refreshing, I find that in a lot of books that go through different narrators, they all kind of sound the same, where as this one felt absolutley different. That was a reason why I didn't like it at first but then I got used to it and even got to love the way Hava feels and reads as a character. I highlighted when another character says to her "You're really articulate about how confused you are" because that's a pretty good summary of how I felt. 
By the end this book felt just as good as the others in the series, and I really hope Kristin Cashore keeps expanding on this world because I'm not sure if I want to let it go yet.

There's some really dense and hard to read topics throughout the story, so I would recomend to read the CW beforehand and to take your time if you have to.