After a van explodes during a Chicago street festival, a Muslim patrol officer goes missing and evidence quickly piles up pointing to his involvement. Burgess, who helped train him, is desperate to prove his innocence, even if that means going against her superiors.
In the Season 5 premiere, the district is in a state of change: Lindsay has moved to New York and the CPD is under scrutiny about the corrupt nature of its institution. Under the watchful eye of the city, the team attempts to bust a gun deal that quickly turns dicey when innocent civilians and children get involved. Tension erupts when Chief Lugo brings in Denny Woods to review the shootout, and Halstead becomes a key player in the outcome of the case.