Smiley, wrestling with retirement and disillusionment, is summoned to a secret meeting with a member of the Cabinet Office. Evidence has emerged that the Circus has been infiltrated at the highest level by a Russian agent. Find the mole, George. Clean the stables. Do whatever is necessary. Reluctantly Smiley agrees, and so embarks on a dark journey into his past - a past filled with love, duplicity and betrayal. Starring the award-winning Simon Russell...

A portrait of the notorious twentieth-century spy discusses his rise in MI6, high-profile intelligence friendships, and twenty-year espionage operation that culminated in his 1963 defection to Moscow.