GameMastery Module: The Demon Within

For many years, a lone castle has stood on the edge of demonic lands, a
beacon of light holding back a sea of darkness. But now it has fallen to the
fiends who threaten to spread beyond to the civilized world. The Demon
Within is a dungeon adventure for mid-level characters, compatible with the
world's most popular fantasy roleplaying game, and part of the GameMastery
Module line. GameMastery Modules also include four pre-made
characters so players can jump right into the action and full-color maps and
handouts to enhance play.