In the midst of urgent calls for change, Sgt. Voight and his Intelligence Unit seek to keep the peace and protect the city they love.
The team responds to the shooting of a 5-year-old girl and they must work the case while facing new obstacles that come from the heightened attention on police reform. Atwater is targeted by a group of officers who want to hurt him for standing against the blue wall. Voight questions whether he's cut out for a new form of policing as he manages oversight from the CPD's deputy superintendent.
The son of an influential former officer is implicated in a murder and Moore pressures Voight to charge him quickly so that the CPD isn't accused of preferential treatment. The stakes are raised in Atwater's fight against the blue wall after patrol officers stop responding to his team's calls. Voight wants to help Atwater end this mistreatment but the two can't agree on the right way to handle it.
Ruzek and Burgess discover a child walking alone in the middle of the street and when they take her home, they discover her entire family has been murdered. Upton is approached with a job offer from the FBI.
A cop is murdered and suspicion falls on someone who has been holding a grudge against the officer. Intelligence works hard to solve the case but Dep. Supt. Samantha Miller is hesitant to defend him until she knows the whole story.
In Your Care
The team investigates a rash of car jackings and finds that the truth is more complicated than they realize. Burgess makes a discovery about a previous case that will change her life forever.
Halstead and Ruzek try to infiltrate a crime ring but the truth is more complicated than they realize. The team recruits an unlikely ally to help solve a murder.
After a series of deadly ambushes, the team goes undercover to bring down a dangerous new drug dealer who is determined to push out the competition. Ruzek's informant proves to be a loose cannon that could upset the whole operation.
Protect and Serve
Ruzek and Atwater are tasked with making an arrest after a high-profile shooting. The situation becomes complicated when it's clear someone doesn't want them to make it back to the station.
When a local business owner is gunned down in his shop, it becomes personal for Atwater, who patrolled the neighborhood as a young cop. Dep. Supt. Samantha Miller comes to Voight with a special request about Andre Cooper.
The Radical Truth
Ruzek's father, Bob, goes missing and the team races to find him before it's too late.
Signs of Violence
A wellness check on a family reveals signs of foul play and Detective Hailey is determined to find the parents and young daughter.
The team pursues a crafty serial rapist. Sergeant Voight finds himself resisting some old, familiar tendencies in his quest for justice.
The shocking murder of a young pregnant woman leads the team on a desperate hunt for the killer, revealing something even darker than expected.