Ok I would just like to say that this wasn't what I expected and I kind of don't know what to think of the book now that I have finished it. Compared to the previous book CoFA, I enjoyed this a little more only because I knew why Jace was acting the way he was in this book from the start. 
 (view spoiler)[To start off I'm going to say what I liked about this latest book in The Mortal Instruments series. Firstly, I did really enjoy the relationship that formed between Simon and Isabelle and also Jordan and Mia. From the last few books I wanted these couples to be together so I'm glad of the outcome. I suprisingly liked reading about Sebastian (and even though he is very sick to want to kiss Clary and want to do other "cough" stuff with her, it was interesting seeing how he interacted with Jace and Clary). That was about the most entertaining parts of the book, and of course the action at the end was good but it took a while to get to. 
 Now for the points I didn't like. The biggest would have to be Jace's and Clary's relationship - I know Jace was not himself and was forced to act the way he did, but the moments he and Clary were together didn't feel like it did in the previous books (the club scene where they got "high" from the fairy stuff was weird and so not them). Next, the plot was really slow and it took me a while to actually finish it. The action was very near the end and it wasn't as good as what the scenes in the first books were. Lastly, OMG I wanted to strangle Alex in most of the book - seriously how selfish can you be to want to make the person you love most in your life live less because you felt insecure and jealous of his life before you. I understand it is his first relationship, but this was just over the top! I hated the ending between Alex and Magnus - Alex didn't even try to stop Magnus from leaving! 
 Anyway, I would say that this book was ok but I wished the plot could have been better and more exciting. I am hoping the last book in the series is going to be extra good, and please Alex grow up and tell Magnus the truth about your feelings!! Also I was very confused when Clary got burnt from the heat off jace when she stabbed him, I thought maybe they could touch each other in the hospital because Clary was the one to bring him back to normal. But apparantely Jace can still burn her, umm okay?? (hide spoiler)]