Melissa Carlson

Burgess and Atwater come across a gunshot victim and the only witness is Olinsky's daughter, and Ruzek goes to Burgess for help with an undercover mission.

When the father of a dead girl mentions the name Dennis Lee, Olinksy sets out to bring down one of Chicago's most wanted fugitives and people traffickers, once and for all. Meanwhile, Sean has an altercation with a fellow officer, and Platt helps Nadia prepare for a polygraph test.

As Dawson's life hangs in the balance, Voight focuses his team on bringing in the man who shot him, Pulpo, by hook or by crook.

Halstead and Atwater go under cover to prevent military-grade weapons from hitting the street. Also, Voight calls in a favour to clear Olinsky's name for Bingham's murder.

A case which sees one of the team taken hostage by a father who is demanding that Intelligence find his daughter who he believes has been kidnapped.

Olinsky's daughter is severely hurt in a massive warehouse fire. Voight investigates the fire's potential origins, connections between the building's owner and potential arson suspects.