Tinker Tailor Soldier Spy

George Smiley has retired but the events that brought about his abrupt retirement still plague him. He runs into a former colleague with information that he suspected for long, the existence of a mole amongst the intelligence sleuths. Smiley is requested to investigate this discreetly and expose the spy.

After making some progress, Smiley settles down on four probable suspects and code-names them:

Tinker, Tailor, Soldier and Spy

How George Smiley traps the spy forms the rest of the story. This is a gripping story by John Le Carre. I found it agitating to pause reading because the suspense is kept up until the last page.