Summer Knight by Jim Butcher

If you thought that Harry Dresden's life couldn't get any worse, this book sets out to prove you wrong. He's in a funk because his girlfriend now has vampiric tendencies, he's almost out of money, and the White Council, the Red Court of the Vampires, and apparently the fairies are all out to get him! To add to the confusion, his first love, Elaine, whom he thought was dead, suddenly reappears. I really liked the way this plot came together. I also thought the faerie mythology was deftly handled. A great addition to the series.