Tinker Tailor Soldier Spy (1979)

George Smiley, a veteran spy from the Cold War era and former successor to Control, is reluctantly drawn back into the espionage game to identify a high-ranking mole within the Circus. As he navigates the shadows of his past and the intricate machinations of the organization, Smiley faces the formidable challenge posed by his longtime adversary, Karla, known as 'The Sandman' from the KGB. Time is of the essence as he races to uncover the traitor's identity before they evade capture, revealing the complexities of loyalty and betrayal in the world of espionage.