Mastering the Vault is a short (24 page) guide for gamemasters of The Whispering Vault. Within this PDF GMs will find advice written by Nigel Findley (author for such popular game lines as D&D, Vampire, Mage, Earthdawn, GURPS, and Shadowrun), a timeline of events, a short hunt (also written by Findley), and a short piece on Unbidden as player characters.
Fully illustrated, Mastering the Vault is the perfect supplement for gamemasters of this cult-classic roleplaying game.