Cassandra Clare told how she was in England sitting in a park plotting for Clockwork Princess and a large worm crawled onto her blanket and she said, "there's going to be a worm in the book."
And indeed the book has a large vicious worm attacking the shadowhunters and this is where the book starts out. Tessa shows up to help in her wedding dress and ends up getting blood all over it. Jem takes a turn for the worse and needs more medicine. With Tessa & Jem engaged, Will has to push his love for Tessa aside. More than anything he wants to see his best friend Jem happy.
Mortmain is determined to get Tessa for his own evil plan to get revenge on the shadowhunters. When he buys up all the medicine that will keep Jem alive Tessa has to put her life on the line to save the man she loves.
There are lots of tie-ins with the Mortal Instrument series through out Clockwork Princess. It made me want to reread the whole series starting with City of Bones.
If you don't want the biggest spoiler of all don't read the family tree on the inside flap of the book. I did that. Ugh!
Cassandra Clare is a great writer and she intertwines a bizarre supernatural world within our world. This wrapped up the series nicely and it was a great end to The Infernal Devices.
To see the full review with movie and book trailers go to: http://anythingbutnormal-juliewallace.blogspot.com/2013/03/book-review-of-clockwork-princess-by.html