Tinker Tailor Soldier Spy (1979)

S1E3 Smiley Tracks the Mole

With Smiley back in the game, he needs to discreetly gather the information and documents essential for his investigation. Meanwhile, Peter sneaks into the Circus' archives and uncovers files that offer a fresh viewpoint on the situation. At the same time, Smiley meets up with an old acquaintance for an interview.