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Bad heroin is causing overdoses in Chicago, and Intelligence is a man down with Voight suspended. Antonio takes charge, but Ruzek undermines his authority.
After discovering the true cause of the high-rise fire, Intelligence races to find the man responsible. And for Halstead, it's personal.
Politics get in the way as the team tries to rescue a teenage girl kidnapped by a robbery crew. Voight and Platt try to exonerate Olinsky.
A ride along goes sideways, and Burgess is faced with a difficult choice: follow the advice of Voight, or a potential new ally.
Fathers and Sons
While undercover, Ruzek discovers his father is working for a suspected drug dealer and is forced to ask the question: is his dad involved?
True or False
The wife of an alderman is beaten to death, and Voight is under pressure from First Deputy Superintendent Brennan to close the case. To elicit a confession, Upton tells a dark story about her childhood.
Intelligence suspects the leader of a local mosque is behind the bombing of an Army recruitment station. After a second explosion, Voight urges Halstead to follow the facts and not let his time in the service cloud his judgment.
Black and Blue
While CPD tries to take down a drug kingpin, Atwater faces a tough choice between doing what’s required to solve the murder of a young dealer and what’s best for the community.
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.
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.
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.
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.
Night in Chicago
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.
Ties That Bind
Upton and Burgess find themselves in a difficult situation when Intelligence tracks a cache of cop killer machine guns to a local gun show in Wisconsin.
Good Men (2)
Second part of a crossover with "Chicago Fire": Using information from Chicago Fire's Cruz, Intelligence chases down the robbery crew that’s been using the lockbox key. Voight is under .. show full overview
Voight and the Intelligence Unit focus all their effort and resources into investigating the disappearance of an exotic dancer who served as a long-time criminal informant for their team.
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