The bespectacled spymaster is once more called from retirement to come to the aid of the 'Circus'--and he returns with a vengeance. The murder of an emigre Soviet General who was also a British agent, sends him digging into the past on a twisted trail across Europe that moves, inexorably, towards a final showdown with his old adversary, Karla of Moscow Centre.

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 ..

The BATAA-winning, international hit spy drama returns for a nail-biting tenth and final series. With the truth about Lucas North finally revealed, and following his rooftop showdown at the end of the last series, Harry is facing some complicated questions about the future of Section D as well as some skeletons from his own past.

The penultimate season of the hugely successful, long-running drama introduces a host of new characters. There's Beth Bailey, a brilliant ex-mercenary who was posing as an Eastern European prostitute when she ran into the team. Dimitri, an ex officer in British Special Forces, has been recruited for his skills in fighting terrorism on the front line. And finally, data analyst Tariq has been fast-tracked through the system.

A series of sinister terror strikes, combined with severe fuel shortages, has plunged Britain into crisis. As a chronically weakened prime minister fights to hold onto power, the public mood turns increasingly anarchic. MI-5 supremo Harry Pearce and team leader Adam Carter begin to face the horrifying possibility that the country is under attack from sinister forces right at the heart of the establishment.

The Cold War heats up when a KGB defector exposes Operation Glass, a potentially devastating Soviet plot to activate sleeper agents across the UK. The charismatic but paranoid head of MI-5, known simply as 'Daddy', assembles a secret committee of spies and intelligence officers to investigate. They're the only colleagues he trusts in a world of double agents and lies, but has he chosen well?