You can also read this review on my blog 
 In short: City of Heavenly Fire by Cassandra Clare does not pack the punch that the original Mortal Instruments trilogy finale had, but was still a good read overall. 
 I have been a fan of The Mortal Instruments series since its release in 2007 (and prior to that I was a big fan of Cassandra Clare's Harry Potter fanfiction). I recall thinking the story and world in the first instalment, City of Bones, was pretty derivative (take one part Harry Potter, another part Buffy the Vampire Slayer, add a smidgeon of Star Wars, and there you have City of Bones), but I instantly fell in love with the characters and the humour of the series and said features remain my favourite parts of Cassandra Clare's writing today. 
 I was perfectly happy with the ending of the original trilogy in City of Glass - it really was a fantastic finale - but when presented with an opportunity to read more from these beloved characters in the form of a new trilogy, a continuation of the series, I was keen. I loved the series, why wouldn't I be excited for more? Well, my attitude changed at some point when I realized that this second trilogy wasn't living up to my love for the original trilogy. I can be picky about series finales; a good series finale is one in which the final book raises the stakes, goes out with a BANG, and is the best instalment in the series. City of Glass gave me all that. So I needed City of Heavenly Fire to give me that and MORE. 
 And well, it came close. There was certainly action aplenty and of course there was the emotional pain and turmoil that Cassandra Clare is so well known for. I like how the story played out and where the characters ended up - in some cases in good positions and in some cases bad. It was a good finale, but the fact remains that the City of Heavenly Fire ending was just not as good as the original ending in City of Glass. I felt that certain issues were wrapped up too easily, some resolutions were resolved too conveniently. The final showdown seemed a bit abrupt, and thus anticlimactic. And as far as emotional feels, well, it came no where close to those of Clockwork Princess. 
 And as for these beloved characters of mine, what does it mean that my favourite scenes in City of Heavenly Fire were actually the ones involving characters from Clare's steampunk trilogy, The Infernal Devices, and the ones involving new characters from her upcoming new Shadowhunter trilogy, The Dark Artifices? Well, it indicates to me that as much as I love the Mortal Instruments gang, I am ready to move on. Their story has been played out and they deserve some rest now because Clare sure put them through a lot of crap over the years. It's time to say good-bye finally, and it's sad, but I'm ready for something new. 
 So while City of Heavenly Fire didn't pack as much of a punch as I needed from a finale for one of my oldest favourite series, it was still a good read overall. I definitely wouldn't say no to Mortal Instruments character cameos in Cassandra Clare's next Shadowhunter trilogy, but I'm satisfied with their ending in City of Heavenly Fire and I'm ready to move on. Bring on The Dark Artifices!