Harry Dresden #4.
Harry and the faeries. The Seelie court's "Summer Knight", an artist with the name Ronald Reuel, is murder mysteriously and the Queen of the Unseelie court want Harry to find out what happened.
Brings Elaine back into his life (who also showed in "White Night", a book later in the series) and get Murphy to finally see Harry do some pretty impressive stuff. She knew it was real before, but now she really knows its real.
Fun, fun, fun.