S4E1 · Glanders

Complete story — includes the ending

Philip confesses to Martha that he killed Gene to protect her, much to her horror. Paige talks with Pastor Tim about finding out that her parents are spies. Gabriel gives Elizabeth and Philip a mission to meet with William Crandall, a deep-cover KGB agent who has access to U.S. biological weapons research. Philip has been attending the same EST meeting as Stan 's estranged wife Sandra. In one meeting, Philip recounts brutally beating a bully when he was young, omitting the fact that he killed him. After the meeting Stan's girlfriend Tori sees them together at a restaurant. In Russia, Nina continues working with Anton Baklanov and later makes a request to her handler, Vasili Nikolaevich, to see her husband. Arkady, suspicious of what Tatiana is working on, learns that it involves chemical and biological weapons. Martha gets the FBI's schedule for Crandall's surveillance, enabling the Jenningses to meet him unobserved. Crandall gives them a vial containing a strain of bacteria that causes glanders, a deadly and contagious disease. When they arrive home Stan angrily confronts Philip about meeting with Sandra. Philip denies that they are having an affair, but Stan does not believe him and slams him against a wall. After Stan leaves, Philip inspects the unbroken vial in his jacket pocket.