This four star rating is a rating for the entire series, not just this book. A nod to the extraordinary story and great writing. 
 With that said, Veronica Roth has been added to the list of authors that have lost my trust. I will be extremely hesitant to read anything by her again. Readers hand authors their hearts when they take up their books. I don't enjoy my heart being crushed. 
 I understand the ending. I understand. But I don't think it had to be that way. I really don't. I'm upset and disappointed. However, it was magnificent. 
 Although not everything is fixed at the end, it's not as bad as the huge unraveled end that was left at the end of Oliver's Requiem. 
 I guess I will leave this review with one, unsophisticated word: 
 Wow.