Summer Knight by Jim Butcher
Harry Dresden is in trouble. He's inadvertently started a war between the vampires and the wizards' White Council, his girlfriend has suffered an unplanned magical transformation and he's in danger of being booted out of his house and office. When a new paying job comes along it seems like a great opportunity for Harry to get on top of his troubles...until he finds himself in the middle of another magical war. Summer Knight , the fourth novel in The Dresden Files , picks up some months after the events of Grave Peril and is the first book in the series to feature extensive continuity call-backs to previous volumes without a huge amount of exposition about what's been going on. Four books and twelve hundred pages into the series, I guess Butcher decided it was time to stop catering for newcomers and get on with business. Having covered evil warlocks, werewolves, vampires and ghosts in the first three books, Butcher explores the faeries of his setting in this volume (tho...