Carrie tries to convince Saul of the connection between Allison and Ahmed Nazari; Saul plants a bug in Allison's phone; Allison heads to a safe house to meet with Ivan after learning that a Russian agent plans to defect.
Bibi prepares to launch the attack at the train station; Otto turns to Saul for help; Carrie and Astrid hunt for Quinn in the aftermath of the attack.