Philip and Elizabeth feel the weight of a new family secret while following up on the KGB’s interests in South Africa. Stan faces struggles both at work and at home. Martha confronts a shocking development.

Martha and Clark’s marriage meets its most challenging test yet. As pressures on Philip intensify, Elizabeth turns to Gabriel with a difficult request. Nina receives a new assignment that reconnects her with her past.

Philip and Elizabeth struggle with the gravity of unexpected collateral damage. Stan and Oleg hatch a risky plan to help save Nina.