Geist: The Sin-Eaters is the seventh Storytelling game set in the World of Darkness.
Players characters are those sensitive to death who have made a deal, often to allow them to cheat death, to return to life bound to a geist. The bound see the world of shadows and ghosts, all the time driven by their geists in different ways to fufill the bargin they have made. Geists are more than ghosts, they are ghosts distilled into almost pure expressions of violence, need or sickness, each embracing the essence of their own death.
This book requires the use of the core World of Darkness book. Although the core book is required, White Wolf and players of the game think of Geist: The Sin-Eaters as its own RPG complete with its own line of sourcebooks, etc.