Based on the 1975 film Three Days of the Condor. Young analyst Joe Turner learns that the CIA has been using an algorithm he developed to spy on American citizens, leading the organization to a terrorist plot that threatens the lives of millions.

Joe escapes from IEP but his safety remains in question. Unsure who to trust, Joe turns to Bob Partridge. Meanwhile, a task force is assembled to investigate the massacre. With his best friend's life now in danger, Sam struggles with his next move.

News of the massacre at IEP spreads. Bob seeks an ally after learning that he must remove himself from the operation to find Joe. Reuel questions Mae's knowledge of Sam's recent behavior.

With the task force closing in, Joe is forced to flee with Kathy. Marty suspects there may be a mole on her team. Reuel grows concerned about Bob's loyalty. Joe's search for answers leads him to two important people from his past.

Reuel and Marty hope that Caleb Woolf will be the key to Joe's capture. Bob attempts to extract information from Joubert. In Riyadh, a plan is put into motion.

Mae is tortured by lingering questions surrounding her husband's death. Caleb tells Joe about his CIA source. Joubert and Boyd cross paths at Kathy's house and make a critical discovery.

Friends gather at Mae's home to comfort her. Iris confides to her that she has information about Alden's work and death. Sharla comes face to face with Joe for the first time. Meanwhile, Mailer gets closer to Mecca.

Joe continues piecing evidence together. Bob deploys a capture mission without Reuel's approval. Mae receives intel from Iris about Sam and Elden. Nathan confronts Gareth.

Deacon's traumatic past comes into focus. Sharla pursues Joubert. Mae makes a terrifying discovery. After the location of the plot is uncovered, Bob considers his options and Joe compels Janice and Caleb to help him.

Joe's morality is put to the ultimate test as he attempts to stop the plague from being released.