S1, E4: After a bomber blows up a city building, additional targets and innocent people remain in danger. Teresa handles the escalating crisis as Jarek and Caleb race against time to track down the suspect who might have ties to the Chicago Liberation Army. Meanwhile, Alderman Gibbons takes matters into his own hands when an armed teenage robber threatens him, which triggers a reflection on his own youth and upbringing when he was more of an idealist.