I was really excited to read this final book, because after the 2nd one, I thought there was a wealth of potential. But I just could not get into it. I don't like when finishing a book feels like a chore, and to me, this felt exactly that way. 
 Let me be clear: I think Marie Lu is a very talented writer. I admire her greatly. There are so many wonderful elements in this story and this series, but in my opinion, characters were sacrificed for action. This book moves SO fast - it runs at 100mph from beginning to end. The problem with that is, when it does slow down, it felt flat and boring (to me). The only character I connected with in this series was June, and I don't feel that the ending, or the events in the novel, served her well. 
 This is an ok book, but I just wasn't impressed by it. I look forward to future books by Lu, though. I think she's a visionary, and I hope that in other works, she'll be able to allow characters to flourish alongside the plot's action.