During a shooting case, Burgess and Atwater discover that the only witness is Olinsky's daughter. Later, Ruzek reaches out to Burgess for assistance on an undercover mission.
The team investigate the links between a crime lord and a deranged artist who may have been using his skills to create something dangerous.
A case involving one of Chicago's most wanted fugitives takes a personal turn for Olinsky; Sean Roman is in trouble after an altercation with another officer; Platt helps Nadia prepare for a polygraph test.