I love products like this. It's not so much a setting as it is a toolbox, something you can use and add to just about any campaign. It's filled with great ideas. I can't think of a setting that you couldn't put just a little devilry in.
Great book! I've used it in multiple campaigns. Everything from a fantasy campaign, a modern supernatural game and in Savage Worlds Rifts. This book has been a great asset!!