In Sir Alec Guinness's first major TV role he plays George Smiley, a retired agent who is secretly brought into ' the Circus' (The code name for British Secret Intelligence Service) to root out a top-level mole. Gradually piecing together the story, the weary but determined Smiley trawls through the murky waters of Cold War espionage and his own past.Special Features Scene Selection, The Secret Centre - (Edited Documentary)