Philip and Elizabeth struggle to contain the risks from Paige's growing relationship with Matthew Beeman, and the Centre sends Philip and Elizabeth on an operation that strains their family and marriage to the limits.
Stan and Oleg wrestle with the harsh consequences of their complicated history, and Philip and Elizabeth face a new mission with devastating implications for their country.
Mapleton, New York, small-town police chief Kevin Garvey juggles personal and professional challenges as the three-year anniversary of The Departure - when millions of people worldwide suddenly vanished - approaches.
Philip and Elizabeth tell Paige more about the family business, but pressing new questions arise when an operation takes a ghastly and unexpected turn, and a sensitive package jeopardises Oleg's life back home.
Paige becomes more enmeshed in her parents' world, and tensions with Matthew Beeman come to a head. Philip and Elizabeth's honeytraps take surprising turns, and Stan faces the consequences of overplaying his hand at the FBI.