District 21 of the Chicago Police Department is made up of two distinctly different groups. There are the uniformed cops who patrol the beat and go head to head with the city's street crimes. And there's the Intelligence Unit, the team that combats the city's major offenses - organized crime, drug trafficking, high profile murders and beyond. These are their stories.
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What Could Have Been 06x19
Intelligence's investigation into the murder of Burgess' boyfriend threatens to reveal a dark side she was unaware of, but the real motivation for his murder uncovers a much more unsettling truth.
This City 06x18
With the threat of a gang war looming, Voight and Ray Price must organize a peace summit to end the bloodshed before more innocent people get hurt. Burgess evaluates her future with Blair.
Pain Killer 06x17
A mayoral candidate is shot by an unidentified sniper, and CPD races to catch the shooter before he can take out his next target.
The Forgotten 06x16
Voight's "stay out of politics" stance is challenged as Intelligence uncovers the details surrounding a prolific serial killer.
Good Men 06x15
Using information from Chicago Fire's Cruz, Intelligence chases down the robbery crew that's been using the lockbox key. Voight is under pressure to bring the crew to justice without tarnishing the reputation of a murdered firefighter who might have been involved.
Ties That Bind 06x14
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 discovers that Upton is dating Ruzek.
Night in Chicago 06x13
Atwater goes undercover to bring down the longtime head of a criminal enterprise and becomes entangled in a situation that tests his allegiances as well as his conscience.
While chasing a heroin supplier, CPD crosses paths with a convicted criminal recently released on a technicality. Halstead's history with the man threatens the team's ability to put him back in prison.
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.
Voight and Ruzek lock horns over how to handle the aftermath of the Antonio situation. Meanwhile, a series of violent carjackings turns deadly, and Ruzek must rely on a C.I. he grew up with to help solve the case.
In an attempt to dig himself out of a hole and save someone close to him, Antonio crosses a line that puts the entire team at risk.