In the dark days of 1941, Britain is in the midst of war. Churchill must stand strong against the might of the enemy – but he is plagued by a darkness in his own psyche. Something he calls 'the Black Dog'.
Can a visiting Swami hold the answer to his troubles? And can Hetty Warner prevent the Prime Minister's adversaries from taking advantage of the situation?
Across London, the Tenth Doctor's arrival may be the nation's only hope – but the Time Lord's plan to help his friend is endangered when he finds himself declared a traitor by the agents of the country he has come to protect...
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