The KGB and the FBI both race to track down a vital agent… everything is at stake.

Philip and Elizabeth tell Paige more about the family business, but pressing new questions arise when an operation takes a ghastly and unexpected turn. Meanwhile, a sensitive package jeopardizes Oleg’s life back home.

Philip and Elizabeth receive surprising news about Henry -- and shattering news about a past operation. Stan might be falling in love, but Philip wonders if something darker is going on.

As Paige becomes even more enmeshed in her parents' world, 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.

Philip and Elizabeth are thrown off balance when things with Tuan take an unexpected turn. Henry makes a startling proposition and Stan has a disturbing encounter with Frank Gaad’s widow.

A surprise assignment from the Centre divides Philip and Elizabeth, forcing them into a moment of profound crisis. Stan gives Henry a tour of the FBI.

In the season finale, Philip and Elizabeth race against the clock as a life hangs in the balance, while Stan faces an uncertain future.

It’s autumn, 1987, and as a major arms control summit looms, Elizabeth is pushed to her limits as never before. Philip, meanwhile, has settled into running the newly expanded travel agency – until an unexpected visitor makes a disquieting request.

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.

After picking up a distressing piece of intelligence, Elizabeth takes extreme measures to get close to a Soviet negotiator. Philip shares some stunning news with Henry.

A sudden assignment pulls Elizabeth away from her family at a crucial moment. At the FBI, a major development leads Aderholt to approach Stan about an urgent investigation.

With the arms control summit under way, a shocking revelation from Philip throws Elizabeth - and her work - into turmoil. Stan follows a dangerous hunch.