Tensions simmer between Philip and Elizabeth as they disagree over handling orders from the Centre. When Elizabeth loses key intel, Philip enlists Annelise on a mission with an unexpected outcome. Stan tries a new approach to mending his marriage with Sandra amidst learning tough news about Nina.
Elizabeth and Philip come together to deal with a mission gone wrong, but struggle to reconcile their increasingly opposing ideologies. Stan welcomes a Soviet defector, Zinaida, to America. Nina acclimates to her new living arrangements.
Danger mounts for Elizabeth and Philip as they get closer to the inner circle of the C.I.A. Afghan Group. Stan monitors Zinaida. Agent Aderholt challenges Agent Gaad on a crucial operation. Arkady tasks Oleg and Tatiana with gathering high-level intel. Martha proposes a lifestyle change to Clark.
Philip faces a moral dilemma while developing an asset. Philip and Elizabeth's friction escalates. Stan develops a theory with serious repercussions for national security. Paige makes a surprising birthday wish.