I want to start out by saying the I really enjoy this series much more than the Mortal Instruments series especially after the last book City of Fallen Angels. I like Tessa as a main character more than Clary. I think that this has everything to do with the Victorian London setting. In fact all the characters seem more mature in this series as opposed to the Mortal Instruments and it's a little refreshing. 
 I didn't love everything about the book, but when I compare it to the Mortal Instruments it's way better. This book definitely felt like the middle book that it is. Not a lot happened within the story. Mortmain is only mentioned we don't see his character at all in the whole story. He's working things from the wings. This makes the action a little dull because most everything revolves around the group trying to find Mortmain himself and when that doesn't pan out they focus on finding out more about him. This in turns just pulls up more questions and mysteries that will hopefully be answered in the next (and last) book in this trilogyClockwork Princess. 
 I like the Clare (as far as I know) is keeping this series a trilogy. As you can understand by my statement above I think her Mortal Instruments series has started to decline since the second half of the series started. I liked the first three books just fine. But anyways this is a review about the Infernal Devices. I will try to keep focused now. 
 The book picks up a couple of weeks after the evens in Clockwork Angel. Charlotte is in danger of losing the institute to someone else unless they can uncover the whereabouts (or substantial information) regarding Mortmain. What then ensues is our love triangle (that's right Tessa, Will, and Jem) embarking on a journey to where Mortmain reportedly grew up, visiting another institute. As mentioned above this persuit does nothing but raise more questions. This isn't necessarily bad. I was hoping to find out more answers and therefore I was driven to read faster and faster to try to get those answers. We did get answers to questions raised in the first book so I suppose it's a fair trade. 
 In regards to the aforementioned love triangle. I almost think that Cassandra Clare thinks that they are mandatory in YA fiction. I don't think there's any question as to who Tessa will end up with. The reader can tell where Tessa's heart lies and it's almost insulting to the other character that Tessa "settles" for him because even though there's a connection, I don't think it goes anything past friendship. I like this character too. He's a completely different YA male lead and Clare writes him really well. I wish there were more heroes in YA like this one. Clearly one can tell the difference in Tessa between friendship and love with her internal monologue. I won't state who, because I think everyone should have their own reaction. 
 I know there are a lot of people who simply cannot fathom waiting until December 2012 for the final installment. Me, I am ok with it. I do look forward to finishing this series, and I will continue reading it even if I stop with the Mortal Instruments. I think part of me is curious to see if she will link the series together any more than having the immortal characters cross over. I guess we'll find out. Until Then!