Chicago Police Department

Still reeling from the death of his informant Anna, Voight faces a new threat as he tries to keep the neighborhood clean.

When a convicted murderer hijacks a prison van, the team scrambles to find him and the abducted prison guard before it’s too late.

The team investigates a string of brutal pharmacy robberies and Halsted connects with one of the victims about their Army careers.

A shocking murder pulls rookie officer Dante Torres into his own neighborhood. As Voight and Atwater help him navigate the case and manage tricky personal dynamics with wary neighbors, Torres realizes his life may be forever changed.

Upton’s dogged pursuit of a missing teenage girl leads the team into a dark web of human trafficking. Chief O’Neal becomes involved with the unit’s investigation when it becomes evident his son, Sean, has a connection to the missing girl.

Atwater’s reactions during a tense arrest are called into question.

When actionable evidence finally surfaces against Sean O’Neal, Upton and the team work relentlessly to build a case in secret.

In an attempt to distract Intelligence from the investigation into his son, Chief O'Neal forces Voight and the team to handle a "dead fish case."

After a shocking discovery, the team begins closing in on Sean O’Neal with every shred of evidence they can find. Determined to keep his son out of prison, Chief O’Neal hires a lawyer.

A series of brutal home invasion robberies finds the team paired with Det. Borkowski, an old friend of Ruzek’s, to work the case.

A shocking ambush at a funeral leads the team into a heated investigation to find the shooters. Much to Atwater’s surprise, he must rely on someone from his past to help in the investigation, dredging up old memories and revealing new truths.

Sean O’Neal surprises Det. Upton with a call from prison, revealing sensitive information. While Upton grapples with how to keep O’Neal at a distance, the team quickly mobilizes to stop a crime in progress before it’s too late.

Voight pursues a drug runner.

Burgess' proximity to a shooting triggers harsh memories.

When a family is poisoned in their home, the team discovers a connection to the Becks.

Voight testifies in a murder trial.

As the team investigates a convenience store robbery, the evidence leads them to an unusual pair of suspects, revealing a dark personal drama and another potential victim. Burgess slowly makes strides tackling her past trauma.

A tragic crime leads the team closer to the Beck family and their deadly ideology.

Atwater’s worlds collide when there’s a shooting at the building he owns in Burnside, which leaves a child dead. Atwater must confront his relationship with his father, Lew, as the brutal case forces them together.

Upton is unwittingly drawn into a deadly betrayal and finds herself in a fight for her life. With minimal leads, Voight and the team scramble to find her before it’s too late.

Torres' troubled past comes to light.

The team must stop Richard Beck.