Voodoo: The Shadow War (Roleplaying Game)

If you want to include a little magic with your modern-day adventures, I -highly- recommend this book. There is some great background material here on Voodoo, as well as some fantastic material on the "Shadow War" between things of the fantastic and things of the "real" world. You'll be wondering whether this could really be true by the time you finish this book. I'd like to see a well-run GURPS: Voodoo campaign just to see how close it would be to "X-Files".

"This is probably my most used GURPS supplement. It has a great, creepy atmosphere. Great job of mixing the horror of the real world with supernatural horror."