4 stars as of right now. I really did enjoy this book and I liked this trilogy. This book nicely times up the loose ends that were left in The Clockwork Prince. Mortmain finally reappears and is determined to carry out his scheme. Charlotte is now going toe to toe with the Consul as he shows his insecurity and plans to replace Charlotte as head of the London institute. This story basically has hit after hit. You feel bad for Jem, Tessa, Will, Charlotte, and everyone else because it's almost like they cannot catch a break. 
 The ending is satisfying and it was interesting to see how Clarke dealt with the love triangle she presented in this book. For me, (because I'm slightly anti-romance), the back and forth and lovey dovey kinda got annoying but it didn't take away my appreciation and love for any of the characters. All you need is love. 
 Overall, it was an enjoyable read. The narrator in the audiobook did a good job of conveying emotion without be over the top and it added to the level of enjoyment I got from this book. 
 4 stars (for now)