This is the first book in a very long time that had me laughing out loud for pages on end. I can't remember when I've been so entertained. The dialog is spot on, filled with dry humor. As I mentioned in my Black Moth review, I actually liked the duke better in that novel than this one. Here he is older and plays a father figure (surprisingly!) for most of the book.
I did find the whole revenge theme somewhat tiresome after a while, and was surprised at the bloodthirsty-ness of even the peaceful characters towards the end--though the violence turns out to be minimal. I let this slide, though, as the story is as much an adventure as romance. I wasn't overly fond of Leon/Leonie, but her interactions with the Duke and his brother Rupert---actually everyone--were the best parts of the book.