Part of the Doctor Who: The Companion Chronicles series
The Vault - an archive of alien artefacts securely stored deep beneath the Angel of the North. There's also a prisoner in the Vault. An extraterrestrial known as the Master. He has been on Earth for some time, but now he's under lock and key. This is his story.
- Format: CD-Audio
- Publisher: Big Finish Productions Ltd
- Publication Date: 31/07/2013
- Category: Science fiction
- ISBN: 9781781780831