Harry Dresden happens to owe two favors to Mab, the Queen of Fairy's Winder Court. She came to collect on one of them. The terms of the favor are non-negotiable. Harry has to rescue a person who was taken by somebody (something) to somewhere. It is never easy dealing with Mab, and before Harry knows it, he is ruthlessly hunted by no less than 3 independent parties. I think this book has more pages of battles than in between battle situations.
In my opinion, the weakest from the latest books, still solid 3 stars.