Philip and Elizabeth are given an urgent task to plant a bug in Defense Secretary Caspar Weinberger's office; Stan closes in on a member of the Soviet Rezidentura.
A new mission with international stakes; Stan makes a discovery that could put the FBI hot on the trail of Illegals.
Philip and Elizabeth disagree over handling orders from the Centre; 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 ideologies; Stan welcomes a Soviet defector to America; Nina acclimates to her new living arrangements.
Erin reopens a rape case Frank worked on 18 years ago; when three teens are murdered, Jackie and Danny can't determine an obvious motive.