The Berlin Exchange by Joseph Kanon

From "master of the genre" (The Washington Post) Joseph Kanon, an espionage thriller set at the height of the Cold War, when a captured American who has spied for the KGB is swapped by the British and returns to East Berlin needing to know who arranged his release and what they want from him.
Berlin. 1963. The height of the Cold War. An early morning spy swap, not at the familiar setting for such exchanges, or at Checkpoint Charlie, where international visitors cross into the East, but at a more discreet border crossing, usually reserved for East German VIPs. The Communists are 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. Keller's most critical possession: his American passport. Keller's most ardent desire: to see his ex-wife Sabine and their young son.

The...

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