A newly-regenerated Doctor takes his young companions, Jenny and Jimmy, to the desolate world of Karn. There they must brave fiendish traps to locate seven crystal keys. If they fail, the Daleks will unleash their evil upon the entire universe!
- ISBN13 9781844353743
- Publish Date 30 October 2008
- Publish Status Out of Print
- Out of Print 12 March 2021
- Publish Country GB
- Imprint Big Finish Productions Ltd
- Format Audiobook
- Language English