I struggled with this because this series has meant so much to me, and I'm coming off the wonderful ending of Clockwork Princess. But, this second TMI trilogy has never felt necessary. I was willing to go with and enjoy it, especially in the last installment, because of the ensemble. But that seemed stalled a bit here. And I didn't feel the fire for Clary and Jace anymore. As a villain, Sebastian never really worked. It didn't feel like it was coming out of an authentic place. It was weird, and the motivations weren't there. Thus, the stakes never really felt all that high. 
 Also, I like long books. I like spending time with beloved characters. But for the life of me I can't figure out why this book needed to be 725 pages. Yes, at the end of a series devoted fans are going to eat up every page. There's a part that wants it to be long so the magic never ends. But here it felt mostly like stalling. 
 I enjoyed my final outing with the gang even if the spark, and the snark, seemed somewhat missing.