I think I'm betraying Brandon Sanderson by saying this... but I found the middle of the book really slow. Not because it lacked action, but because there was too much of it. Does that make sense? 
 Either way, I enjoyed the book a lot and there is a plot twist at the end which was a bit heartbreaking. The plot deals with someone wanting to drown the city of Elendel in chaos. This someone presses the right buttons to provoke a social upheaval, and it's up to Wax and Wayne to stop it and find the reasons behind this plot. 
 More of our old characters make an appearance one way or another, which is what I like the most about this series. Seeing how the past is viewed in this new era, how events we read first hand are interpreted centuries after they happened. I found Wax a bit boring in this book (AGAIN THAT BETRAYAL FEELING!) and mopey, I sighed whenever I had to read from his point of view. Wayne, however, is still interesting and fun to read. He is amazing and a genius. 
 There is a new character called Meelan who is a nice and fresh addition, but some old characters barely make an appearance, for example, Steris. She is fun to read and deserves more time in the stories! Less Marasi and more Steris please! 
 So, great story, great characters, a bit too much action.