In the series finale, Teresa gets a return visit from FBI agent Cuyler (Adam Arkin), and Jarek is determined to resolve some lingering issues that have plagued the Wysockis. Meanwhile, Teresa and Jarek play all their cards in their case against Gibbons
Teresa, Jarek and Caleb search for a witness in the case against Alderman Gibbons; Liam is forced to take matters into his own hands.
A possible hate crime spurs Teresa to try to stop an unethical promotion system within the police force, but her daring actions awaken suspicion in Gibbons. Meanwhile, Vonda gets an anonymous package that makes Jarek confront truths about their family
Teresa and Jarek face a surprising setback in their war against Gibbons when a crooked city official gets acquitted by a deadlocked jury. They look into the situation and find not only jury tampering, but other misdeeds as well.
The mayor faults Teresa for rising crime rates after five people are shot in Lincoln Park, and Teresa wants Jarek to find the shooters so she can rebuild her public image. Elsewhere, Isaac and Vonda must reinvestigate an old domestic-abuse case.
FBI Division Chief Cuyler (Adam Arkin) interferes with Wysocki and Evers’ investigation of an international drug dealer; Liam feels vulnerable while visiting grieving families.
While searching for a drug supplier, Wysocki and Evers uncover an elaborate murder case; Teresa tries to get new radios for the department.
Detective Wysocki and Evers encounter uncooperative locals while investigating the death of a teenager in Chinatown; Teresa’s brother-in-law gets involved with a shady business deal; Liam goes deeper undercover.
When a bomber blows up a city building, additional targets and people are left in danger; a teenage armed robber threatens Alderman Gibbons.