I thought this was a nice return to the initial style of the Dresden Files. The previous three or so books have had a lot of changes, and a lot of new information has been released, and while some new information was discovered in this book, it was mostly a story about Harry, getting himself into trouble, and figuring out how to get out of it again. Nothing extremely earth-shattering was revealed, which was very nice.
After hearing Jim Butcher plans on releasing a total of something like 30 books, this book helped establish how he's going to handle the second half of this series, which I enjoyed.