Tinker Tailor Soldier Spy (1979)

S1E2 Tarr Tells His Story

Title: Tarr Unveils the Truth Plot: Ricki Tarr, a seasoned operative, shares a gripping narrative with the intelligence leaders that convinces Smiley to rejoin the Circus and covertly identify the mole. His story centers on The Sandmann, the KGB's rival and adversary of Smiley, detailing the intricacies of his network within the Circus.