 | Edition: | UK (hardback) | | | Released: | September 1981
| | | Publisher: | WH Allen | | | ISBN: | 0-491-02953-5 | | | Format: | hardback | | | Owned: | | | | Buy: |  |  | (Not currently available) |
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Cover blurb:
The Doctor, Romana and K9 — and a young stowaway called Adric — are trapped in the alternative universe of E-Space. Seeking help, they land on an unknown planet — and find a nightmare world where oppressed peasants toil for the Lords who live in the Tower, and where all learning is forbidden — a society in a state of decay. What is the terrifying secret of the Three Who Rule? What monstrous creature stirs beneath the Tower, waking from its thousand-year sleep? The Doctor discovers that the oldest and deadliest enemy of the Time Lords is about to spring into horrifying action. | 
