Mind of Evil
Eminent scientist Emil Keller has developed a revolutionary new process for the treatment of hardened criminals. His invention, the Keller Machine, is being heralded as a major scientific breakthrough.
But Professor Keller is in truth the Master and the Keller Machine is much more than a mere machine. Soon the Doctor is involved in a bitter struggle with his deadliest enemy, an alien mind parasite, and a diabolical scheme to plunge the world into a Third World War...
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Terrance Dicks
Terrance William Dicks was an English author and television screenwriter, script editor and producer. In television, he had a long association with the BBC science-fiction series Doctor Who, working as a writer and also serving as the programme's script editor from 1968 to 1974
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