During the early 1970s Cold War, British Intelligence's head, Control, resigns after a botched operation in Budapest. He suspected a mole among four senior officials and tried to uncover their identity.

Tinker Tailor Soldier Spy
A seasoned spy is reluctantly pulled back into the world of espionage to uncover a mole secretly working within the British intelligence agency, MI6, amidst the high-stakes tensions of the Cold War.