Update: Review 
 I quite enjoyed the book and Mark was a very interesting character, definitely my favourite! Emma and Julian were pretty cute, though not as great as Cassie's previous couples. The mystery was cool and I didn't manage to guess who the villain was, even though I'm usually pretty good at it. Overall, it was a fun book with a great cast of new characters and a lot of old ones making appearances - which I LOVED! I do stand by what I said before though, that Cassie should move on from shadowhunters now as her books are getting a little repetitive and recycling old ideas. 
 Eg. (contains minor spoilers from this book and previous series): 
 - There is a scene where the institute is surrounded by the guardians, it reminded me a lot of the scene from Clockwork Angel where the automatons are attacking the institute when Jem and Tessa return from Blackfriars bridge 
 - There is a mini plot about how Julian is trying to keep the institute under the Blackthorns control and is scared the Clave will take it from them if they find out about Arthur. In TID Charlotte was trying to keep the institute under her control... 
 - The scene where the whole gang goes to Midnight Theater to witness the lottery was very similar to a scene in Clockwork Angel where Will, Jem and Tessa go that vampire party where they find Nate. 
 - The whole thing with the poem about Lady Midnight in a Shadowhunters storybook being relevant to the plot reminded me of how the story about the deathly hallows was in a wizards children's book The beedle and the bard in Harry Potter. 
 There are more, but these are the main ones I noticed. I will continue the series and will probably enjoy the rest of them too, but I think all of these recycled ideas are a sign that Cassie should come up with something different as she seems to be using the same formula over and over again. And its getting old! 
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 I do love Cassie's books, but ENOUGH IS ENOUGH!!!! Am I the only one who thinks that she needs to STOP WRITING BOOKS ABOUT SHADOWHUNTERS!!!!!!There is a limit to everything and now it just seems like Cassie doesnt have any other ideas so she keeps recycling her old ones to make money. I love her books, but I have started to notice similarities like how TMI, TID and TDA are all set in an institute. Just changing the city doesnt really make any difference. Plus, if she is so desperate to write another series set in that world, then at least try to make it different, like exploring how the vampires or werewolves live. Or even a demon. Anything's better than writing about shadowhunters again. 
 More similarities I noticed... 
 (WARNING: SPOILERS FOR TID AMD TMI) 
 - Sebastian and Mortmain both tried to create a new race 
 - There is an angel trapped somewhere. 
 Not to mention the characters are pretty similar too. 
 (END OF SPOILERS) 
 I get that family connections are cool and they make me mildly curious, but that is so not a good enough reason to write another freakin series!!!!! I love her work, which is why I want her to stop trying to make me hate her!