Antonio (Jon Seda) struggles with his guilty conscience as he tries to take down a major drug dealer. In order to protect his team, Voight (Jason Beghe) takes a big shot at Kelton (guest star John C. McGinley).
A violent crew is hitting pharmaceutical delivery trucks and stealing drugs, but their motivation is more complicated than just money. The case tests Upton (Tracy Spiridakos) and Ruzek’s (Patrick John Flueger) relationship.
Intelligence’s investigation into the murder of Burgess’s (Marina Squerciati) boyfriend threatens to reveal a dark side she was unaware of. But the real motivation for his murder uncovers a much more unsettling truth.
The team travels to a Wisconsin gun show to take down a supplier who’s manufacturing “cop killer” machine guns. Before going undercover together, Burgess (Marina Squerciati) discovers that Upton (Tracy Spiridakos) is dating Ruzek (Patrick John Flueger).
With the threat of a gang war looming, Voight (Jason Beghe) and Ray Price (guest star Wendell Pierce) must organize a peace summit to end the bloodshed before more innocent people get hurt. Burgess (Marina Squerciati) evaluates her future with Blair (guest star Charles Michael Davis).
When a defense attorney is murdered after a fundraiser, Intelligence must confront the world of campaign finance, which makes them reconsider their decision to back the current pro-police mayoral candidate.