Berlin. 1963. The height of the Cold War. An early morning spy swap sees Communists trading two American students caught helping people to escape over the wall and an aging MI6 operative. On the other side of the trade: Martin Keller, a physicist who once made headlines, but who then disappeared into the English prison system. Martin has worked for the service long enough to know that nothing happens by chance. Someone wants him for something. Something which he cannot learn until he arrives in East Berlin, when suddenly the game is afoot.
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