2003 · ソースブック（プレイを拡張するルール／オプション）
Mastering the Vault
This 24-page guide supports gamemasters of The Whispering Vault. It includes advice by Nigel Findley, a timeline of events, a short hunt scenario, and guidance on using Unbidden as player characters. The fully illustrated PDF is formatted for home or office printing.
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。