Turn Coat

The following blurb is taken from www.jim-butcher.com:

The Warden Morgan has been accused of treason against the Wizards of the White Council—and there's only one, final punishment for that crime. He's on the run, wants his name cleared, and needs someone with a knack for backing the underdog. Someone like Harry Dresden.

Now, Harry must uncover a traitor within the Council, keep a less-than-agreeable Morgan under wraps, and avoid coming under scrutiny himself. And a single mistake may cost someone his head—someone like Harry.

To be released in April 2009