Philip and Elizabeth are given an urgent task to plant a bug in Defense Secretary Caspar Weinberger's office, but they risk exposure when an unwilling maid of the Weinberger home refuses to cooperate.
A mole hunt within the KGB causes suspicion amongst allies and shatters trust within the Jennings' marriage; Stan's plan to keep his mole safe puts her at even greater risk of discovery.
A crucial agent crumbles under emotional distress and threatens to topple a valuable network of KGB informants; Professionally, Philip and Elizabeth are tasked with infiltrating the FBI's new communications encryption system.
A German assassin has been ordered to kill American scientists involved in the ABM program. After the mission is aborted, Phillip and Elizabeth must stop him and prevent a possible war.
Phillip and Elizabeth shock their children when they announce they are separating; Gaad orders an unauthorised mission to grab a KGB agent after Amador goes missing, with grisly consequences.
