"The Mystery of Vault 31 is a limited time multi-stage questline in Fallout Shelter. It consists of five sequential quests. This page serves as an overview for these quests."@en . . . . "The Mystery of Vault 31"@en . "The Mystery of Vault 31 is a limited time multi-stage questline in Fallout Shelter. It consists of five sequential quests. This page serves as an overview for these quests."@en . . .