Dark Mysteries: Soul Keeper is a special edition of the Dark Mysteries adventure game where you have to solve the mystery of a renegade spirit that is murdering people on an island. The eerie plot challenges you to banish a spirit that is using human souls to become immortal. Dark Mysteries: Soul Keeper is not an original work - it's based on the H.P. Lovecraft novel but it does introduce some new additions not available in the regular version such as a bonus chapter, and in-game strategy guide, some behind-the-scenes video and some concept art for the game.