Call for the Dead (George Smiley #1) by John le Carré

Paperback published by Bantam  1979

John le Carré classic novels deftly navigate readers through the intricate shadow worlds of international espionage with unsurpassed skill and knowledge, and have earned him -- and his hero, British Secret Service Agent George Smiley, who is introduced in this, his first novel -- unprecedented worldwide acclaim.

George Smiley had liked Samuel Fennan, and now Fennan was dead from an apparent suicide. But why? Fennan, a Foreign Office man, had been under investigation for alleged Communist Party activities, but Smiley had made it clear that the investigation -- little more than a routine security check -- was over and that the file on Fennan could be closed. The very next day, Fennan was found dead with a note by his body saying his career was finished and he couldn't go on. Smiley was puzzled...