After being left at the altar, Lucas begins to pick up the pieces; Brooke's past haunts her while she considers adoption.
Iraq veteran Walter Sherman helps a teenage boy locate his missing father, a military pilot who vanished while on a mission; Leo and Walter keep a watchful eye on a teen parolee.
Carrie urges Qasim to stop the subway tunnel attack, Ivan tells Saul how Allison will be extracted from the country, Saul offers Carrie a new job at the CIA, and Carrie barricades herself in Quinn's hospital room.
Carrie and Saul urge the doctor to revive Quinn so they can find out where the attack occurred. Allison is instructed to make sure the attack on Berlin is successful and Carrie investigates at the train station.
Sam's old friend Mack shows up and asks for help in a case against a child predator named Rincon; Michael meets Mason Gilroy, an associate of Tom Strickler's, who plans to become his new employer.