Several women with magical abilities have been committing suicide, but Murphy thinks that all might not be as it seems. When she brings in Harry, it quickly becomes apparent that Thomas has been involved. 
 This instalment may be the most referential to date. Several characters returned, and many of the plotlines that Harry has been juggling over the past few books finally get resolved (or, at least, seem to). 
 Over the last few books - certainly since Dresden's first encounter with Lasciel - things have been getting darker. It's been clear for a while that, at some point, Dresden was going to have to take a long hard look at what he's becoming. This is the book where that happens, and I'm glad that Murphy got to be a part of it (she calmly and kindly leads Dresden toward the introspection he's been avoiding, as a concerned friend). 
 Molly is an interesting sidekick, though largely untouched. She has a few hijinks moments, learns a few lessons, but largely stays out of the fighting. Which is not a bad thing. I think I might feel quite differently about Dresden if he brought her into things so soon.