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Burgess fights for her life. Dep. Supt. Sam Miller is desperate to find her son’s killer. Voight and Upton deal with the aftermath of their deadly decision.
When a P.D. informant is murdered, the team digs in to track down the perpetrator only to learn a shocking truth. Voight and Ruzek strategize to help Burgess.
Halstead’s past resurfaces when a former Army colleague is implicated in a deadly blast. As the FBI launches an investigation into Roy’s disappearance, Upton feels the pressure of the secret she and Voight are sharing.
When Upton and Ruzek answer an emergency call to an abandoned house, their investigation leads them down a dark path.
As the team works to solve a deadly shooting in Burnside, Atwater realizes he has a very personal connection to the case.
Ruzek reunites with an old colleague to take down a crime ring, but when things don't add up, Voight and Burgess do some investigating of their own.
As the team works to bring down a drug ring, Voight builds trust with a new informant. However, it soon becomes clear she has a plan of her own.
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