The Bureau for Paranormal Research and Defense (BPRD) is hot on the trail of a witch who has been discovered stealing various collections of the occult. It's all part of a plot to see the re-emergence of the Nazis, led by one Hermann von Klempt. And it's up to our favorite demon to stop them in Hellboy™: The Science of Evil. This sample from the Prima Guide for the game will get you ready for the adventure.
