Spoiler free review. The beginning was a tiny bit slow. But the ending. Oh my gods. Things got insane! I honestly don’t see much to be angry about. This book ended up being just about as great as all the other three. Poppy and Casteel are everything! The world building does kind of continue on. But it’s definitely necessary.
I don’t know what else to say, other than this still continues to be one of my favorite series of all time.
And yes, you do need to read A Shadow In the Ember before reading this one.