The Doctor, Ace and Mel are caught in a forever night. After crossing the threshold, a strange world awaits them.
| ISBN: | 9781781788332 |
| Publication date: | 31st October 2018 |
| Author: | Mark Morris |
| Publisher: | Big Finish Productions Ltd |
| Format: | CD-Audio |
| Series: | Doctor Who Main Range |
| Genres: |
Science fiction: space opera |