OmU Tinker, Tailor, Soldier, Spy

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In 1970s England, Control, the head of MI6, dispatches a spy to meet with a Hungarian general who knows the identity of a Soviet spy within the organization's ranks. However, the mission goes wrong, and the general dies before he can reveal the information. Undersecretary Oliver Lacon calls veteran agent George Smiley back from forced retirement to ferret out the mole and stop the flow of vital British secrets to the Russians.