Doctor Who: Shada: The Lost Adventure by Douglas Adams [Hardcover] by Gareth Roberts
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Shada is an unaired Doctor Who story written by Douglas Adams, author of The Hitchhiker's Guide to the Galaxy. It was intended to be the final serial of Season 17 1979-80), but was never completed due to a strike at the BBC during filming.
The Doctor's old friend Time Lord Professor Chronotis has retired to Cambridge University. He took with him the most dangerous book in the universe 'the Worshipful and Ancient Law of Gallifrey'. What is the connection to the lost planet Shada, a prison built by Time Lords? Who is Skagra?