When Lindsay is tipped off about a father looking to avenge his daughter's death, Olinsky goes undercover as a hitman for hire; and Gang Intelligence reinvestigates the original case. Meanwhile, Ruzek is placed on patrol duty after returning from his undercover assignment.
Halstead goes undercover as a guard at a treatment center for troubled girls after one of its patients is found dead in an abandoned building; and Platt feels guilty because the victim was previously brought into the District, but she doesn't recall her.
The investigation into the murder of a sex offender leads to a private police force that may be involved in illegal activities. In other events, Halstead has Jimmy's DNA tested to see if he actually is Lindsay's father.
The team investigates a deadly crash involving CFD lieutenant Kelly Severide's car; Voight assigns Burgess with Olinsky; and Lindsay contemplates meeting her estranged father, who's been released from prison.
The team investigates the death of a witness in the rape-and-murder case of a wealthy young man; Stone offers Antonio a job in the state attorney's office; and Burgess and Sorensen's body cameras record a bizarre exchange with a man that they pull over.
Burgess and Sorensen discover a dead teen girl at the home of a baseball player who's friends with Olinsky; Burgess and Sorensen hunt a thief who turns out to be a cop with a rocky past; and Lindsay receives flowers.
The team hunts drug dealers selling fentanyl, which has been linked to multiple overdoses around the city; and Tay and Burgess discover a bloodied child who shares a twisted secret about his home life. In other events, Mouse contemplates reenlisting in the Army; and Platt informs Tay about her next assignment.moreless
A car plows through a crowd outside of a concert venue and is followed by gunfire, sparking fears that it may be terror-related. In other events, Burgess spots Atwater's brother where he shouldn't be; and the team works to bring peace to the community before more blood is shed.
Intelligence investigates when a young man is beaten and his fiancée is apparently abducted. In other events, Lindsay surprises Halsted with a big question; and Cdr. Fogel takes Platt to task for going over his head to have Tay assigned to District 21.
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