Berlin game
(Book)

Brahms Four is the best East German source the British ever had, but now he wants desperstely to come over the wall and escape from Berlin before he is exposed by a mole. There is only one person he still trusts: British agent Bernard Samson of the Secret Intelligence Service (SIS). In this opening book Len Deighton's Game, Set, Match series, Samson is thrown back into the field after having been retired to a desk job five years earlier. But before he can even set out on his mission to help Brahms Four, he discovers there's a traitor very close to him. He must find out who it is...and get Brahms to the West before it's too late.