There is only so many things you can say about a book that breaks your heart. This book was so fantastically written, I don't even have the words to explain how amazing Cassandra Clare's writing is. 
 Clockwork Princess is the perfect conclusion to The Infernal Devices. Everyone wins when you read this book, whether your team Will or team Jem. At the moment I am rereading the entire series and it is even better then it was when I first read it.