Book 4 brings the series back into the realm of urban fantasy. Unlike book 3, we are back to the PI wizard and the connections to the real world. Four books into the series, there continues to be an escalation of his powers and an escalation of the quality of "bad guys". This is my favourite one behind the first in the series. Not as much action as the third one but still very exciting. Butcher continues to deliver. If you are reading these reviews and haven't read these books, seriously...what are you waiting for?