No doubt remains; a mole has infiltrated the highest level of the Circus, code name for British Secret Intelligence Service. Sidelined agent George Smiley is covertly tapped to root out the traitor-a task that requires an intensive dig through the labyrinths of Cold War espionage and his own past. Stellar ensemble casts bring John le Carre's thrilling tales of Cold War-era espionage to vivid life in these television classics.

Some say George Smiley is in innocent retirement. Others say he was sacked after the Czech scandal. But all agree that nobody ever leaves the 'Circus' without some unfinished business. Brought out of retirement to trace an enemy infiltrator in the department where he was once the prize employee, the shy and retiring master of espionage moves forwards to investigate and finds himself going backwards over very old ground ...