This book is essentially the Prohibition era equivalent of the Dresden Files, and it's great fun. It makes nice use of folklore for the faeries in the human world, such as Oberon's diet of milk and cream, and also inventively depicts a faerie world influenced by its ties to real world Chicago. (The faerie syndicate boss known as Queen Mob was one of my favorite touches.) There's a few more out in this series already, and I look forward to seeing what else Marmell has done with it.
Overall: A