Following the shocking events related to a fallen officer, Teresa and Jarek vow to bring whoever is responsible to justice. In the meantime, Alderman Gibbons pays a visit to the victim's family to offer his condolences and plant a few seeds of betrayal, implicating members of the Chicago Police Department. As every officer in the city hits the streets to avenge this cop killer, Jarek and Caleb follow up on some of Liam's leads, while Vonda and Isaac are promoted to the organized-crime task force.

Jarek and Caleb arrive first on the scene at a bank robbery and chase the thief through the streets of Chicago only to find he has met a gruesome end. As the Chicago Police Department pieces together the clues of the robber, Superintendent Colvin conducts a critical meeting with Alderman Gibbons about a key construction site. Duplicitous politicking raises the stakes and further exposes the depth of corruption in the city.

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.