The Doctor, Nyssa and Tegan and Adric crash land on to a planet oppressively ruled by the Unitatus. The Doctor discovers a plot to exploit his own Gallifreyan ancestors. He has to find out why his future self has become his nemesis.
Lance Parkin is a British author, best known for writing fiction and reference books for television series, in particular Doctor Who (and spin-offs including the Virgin New Adventures and Faction Paradox) and Emmerdale. He also worked on the Emmerdale television series as a production assistant.
Lance Parkin. Wikipedia.