The Doctor faces the end of his life as the Master's plans hurtle out of control. With the sound of drums growing louder, and an ancient trap closing around the Earth, the Doctor and Wilf must fight alone. But sacrifices must be made, and the deadly prophecy warns: "He will knock four times."
A village in Ukraine, near the Russian border. The only thing that slightly disturbs the peace there is the occasional death of an elderly person. That is also why Anatoly returns there: to take care of his dying mother.