I thought this book was amazing, and an immensely satisfying end to the series. Whatever words come out of my mouth (or keyboard) won't be enough to express how much I love this book. It just won't. So I'll sum up some more important points that I want to mention.
Since the Mortal Instruments and Infernal Devices are somewhat related, all the pieces seem to fall into place after this book. A lot is explained, and I like that.
Okay, that was two sentences. But I've been dying to talk about the best thing of all. And I'll try to make it more interesting than above.
The love triangle: I am not totally fond of love triangles in YA books, because I hate how you have to choose between one or the other. It causes jealousy and anger. But this book proves that love triangles can truly be a 3-way relationship, all tangled up in complicated ways. The two boys, Will and Jem, and the main character, Tessa, aren't connected by jealousy or anger at all. They all care for each other, yet cause pain to each other because they can't satisfy all three of them. I'll explain each relationship in more detail:
Will and Jem: These two are parabatai, and have been best friends for years. Although they both love the same girl, they aren't aware of each other's feelings until later on. And they would never want to cause pain to each other, because of such a strong bond that has kept them together. Will owes Jem for his understanding personalities, and for being his anchor and guide in his journey to cope with the life he has to bear. Jem understands this, and is always the one to step aside and comfort Will. They cannot afford to lose each other, or else they will permanently lose a part of themselves. This is the relationship that makes this kind of love triangle possible; one that doesn't stem from jealousy or enemies.
(The next might be spoiler, but not much.)
Will and Tessa: Will loves Tessa. Yet he knows he can't show it, or else risk hurting and losing Jem for a reason that he can't bear. He doesn't want the guilt that his own selfishness had caused the person he hung on to as a reason to keep living, pain, and an end to Jem's happiness. That is why he is willing to bear the pain and step aside to let his parabatai be happy, while sacrificing his own happiness.
Tessa to both: Tessa loves both of them equally, which is essential. There isn't a single choice that will leave her happy, because of the knowledge that choosing one means hurting the other. It's so complex, yet so amazing.
Ugh, I'm done ranting, this is all I can do. I give it 10 out of 10. :D
