The first thing I should mention is that Dawn Cook is Kim Harrison. The one who writes the kick ass witch series The Hallows. While I enjoyed this book, and another kick ass heroine, the realization that Kim and Dawn are the same kind of paled this book.
The idea that a princess was actually not a princess, and was just being used to keep the real one safe is really great! The prose was okay, nothing special. Tess is fun, but no Rachael.
This book gets 3 stars for being good, but not amazing.