White Night (2007)

A sensational addition to the Dresden Files adventures-from a USA Today bestselling author.Professional wizard Harry Dresden is investigating a series of deaths in Chicago. Someone is killing practitioners of magic, those incapable of becoming full-fledged wizards. Shockingly, all the evidence points to Harry's half-brother, Thomas, as the murderer. Determined to clear his sibling's name, Harry uncovers a conspiracy within the White Council of Wizards that threatens not only him, but his nearest and dearest, too...