Wow... This is going to take Mockingbird-Level recovery time, especially since I don't have the 6th book on hand, so I won't fully know what happens. It's getting increasingly harder to write these reviews as spoiler-free as possible, so this one will be shorter.
I really liked how Mafi included excerpts from Juliette's time in the asylum throughout the story to support the theme of this book, which is Juliette battling with her past and trying to keep it in the past, recent discoveries making her relapse to the mindset she had in the asylum. I also really appreciate how the book makes it clear that despite her powers, Juliette is just a normal teenager who has no experience with leadership, politics, or anything of the sort, which is just one less thing for me to suspend my disbelief about.

Also can I just say how much Warner's two blank pages at the end said? Despite being blank, we can guess what they symbolize, and that really shows that Mafi is good at conveying ideas