Ames' guilt seems certain in the series finale, but Sandy is still searching for more proof to convince the Justice Department to take action. Later, after Ames is caught, he mulls what—if anything—he's willing to say.
The Berlin Wall falls and Communism collapses, but the CIA task force is still digging for clues about the cause of the assets' compromise, even though Sandy is convinced it's Ames, whose expensive lifestyle is making it hard to hide his identity.
Sandy and Jeanne's mole hunt proceeds once they put aside their differences, but their investigation hits a snag when Sandy learns upsetting news about General Polyakov. Meanwhile, Ames prepares for a crucial polygraph test.
Sandy learns a breach remains at the CIA and clashes with Jeanne, a senior officer reviewing the investigation whose presence also rattles Ames, who feels pressured by the Soviets to reveal more information and begins to worry about his wife's out-of-control spending.
Edward Lee Howard is hunted by the FBI and the CIA after being identified as the mole, but Sandy is still worried about leaks while trying to prove an asset's importance. Elsewhere, Ames bonds with Yurchenko on a trip to Canada.