In 1990, the Russians discover a secret room in the Kremlin that is a meticulous recreation of London life in the 1960s. After savvy KGB agent Nina Grishina figures out that the room was used to train two agents who haven't been heard from since 1966, she sets off for England to lead the hunt.

Nina's arrival in London arouses the interest of the CIA, which only intensifies after the sports-obsessed London KGB chief is observed handing over a suspicious film reel. After their reunion, Jeremy and Albert return to their UK lives, but Albert panics when he sense his family is in danger.

Together again, the sleepers take to the road in Jeremy's red Ferraris to elude the KBG stakeout. Albert's effort to reassure Sandra backfires, and she has to admit her jaded mother may be right. MI5 gets in deep, tripping over the CIA, while Nina outwits them all.

The jig is up and the sleepers are going in. Nina begins to regret her success when she learns the truth. Meanwhile, Comrade Zorin is out of the mental hospital and back in command of the mission.