Peter von Berg

When Philip and Elizabeth are given an urgent task to plant a bug in Defense Secretary Caspar Weinberger’s office, they risk exposure when an unwilling maid of the Weinberger home refuses to cooperate. Stan closes in on a member of the Soviet Rezidentura in an effort to uncover the identities of deep cover Directorate S operatives.

Freed from her psych ward confinement, Root receives a directive from The Machine that requires Shaw's assistance – by any means necessary – and takes extreme measures to gain her compliance. Also, Reese and Finch look for clues as to why a mild-mannered estate investigator’s number has come up. Kirk Acevedo (Fringe) guest stars as Timothy Sloan.

When an assassin attempts to kill President Reagan, Philip and Elizabeth scramble to handle the fallout within the KGB. Meanwhile, Stan pressures his source within the Rezidentura to find out if the KGB was responsible for the attempted assassination.

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 while personally they are forced to grapple with one of the darker aspects of life as a spy.

A mole hunt within the KGB causes suspicion amongst allies and shatters trust within the Jennings’ marriage. Meanwhile, Stan’s plan to keep his mole safe puts her at even greater risk of discovery.