This book is one of my favourite of Dresden Files. There are several books in the series that are better than Proven Guilty, but still, this one is quite strong and very enjoyable. 
 Harry is now a part of the White Council and a Warden, and I really enjoyed seeing how he adjusted to his new role. After reading how he always got into troubles with the White Council, it was interesting to see him as a part of it...not that he didn't get into trouble with them again;) But that wasn't really his fault. And the truth is, a lot of the White Council wizards aren't the most pleasant guys, but at least now Harry has some important friends on the Council too, so that's always a plus. 
 Another interesting thing was of course that Harry now has an "additional job", one which may be a lot more difficult than dealing with the usual monsters...I really liked that part of the story, and how it played out in the end. 
 There was quite a lot of humor in this book, there was an investigation going on, but it felt different than some of the earlier books where the investigation was the main part of the story. We got to see a bit of what's really going on behind the scenes, that there are some larger forces or people at work there, and that there is a lot more at stake than just another case of black magic or murder. I like reading about Harry being a detective, but I am glad that it's also something deeper than that, which is slowly being revealed in every book.