My Thoughts: As a whole I love this series more than the recent Mortal Instruments books. There seems to be a unity that has been missing in MI since the first few books. Even though they all have their separate problems that they deal with throughout the book when needed they are all there for each other.
On the other side, I don't love Tessa and Jem. I think they are great characters individually but together they lose something, especially Tessa. She is too much rainbows and roses when they are together or she's thinking about him. She loses that grit and steel that makes her a great lead female and might as well be Jessamine. I don't necessarily like Will with her either, he lost some of his appeal when he reverted to the happy, loving Will.
Overall the story had great flow with plenty of ups, downs, twists and turns that keep you reading until the very end. I'm looking forward to finding out more about Will's sister and what/who turns on our happy little group next.