Kidd and Severide's honeymoon is interrupted by a dangerous person from their past. Kidd's former academy classmate joins Firehouse 51. Brett and Violet reflect on their relationships.
After one of Sylvester’s plans results in an unexpected outcome, Pat calls upon an old friend for help. Meanwhile, Beth uncovers a new suspect in their murder investigation, and Courtney reaches out to Cameron.
June and Moira join a rebel outpost. As a pregnant widow, Serena tries to restore her status. Aunt Lydia questions her strict methods of dealing with Handmaids.