As the summit fast approaches, Elizabeth enlists Philip's help for a mission that could yield game-changing intel.
Elizabeth targets an old source who could tip the balance of the upcoming summit, as Philip deals with business at the travel agency; Stan learns an old friend is back in town.
A surprise assignment from the Centre divides Philip and Elizabeth, forcing them into a moment of profound crisis. Meanwhile, Stan gives Henry a tour of the FBI but he might end up seeing too much.
As Philip and Elizabeth grapple with a momentous decision, Tuan takes matters into his own hands in the Morozov operation. Back in Russia, Oleg's investigation collides with the realities of the Soviet system.
Gabriel stuns Philip and Elizabeth with a sudden announcement and a crushing revelation about Philip's past. Stan and Aderholt draw a fly into their web, while Oleg and Ruslan ambush their first suspect.