When a 10 year old girl is shot, the Commander tells Voight to work it. It seems like the girl was scheduled to testify against a kid who committed a crime. The kid is a promising basketball player whose career will end if he's convicted. While the kid has an airtight alibi, they learn he has a relative who's a gang leader. The man is in prison so they go to see him but a Fed tells Voight the man works for them so he's off limits. Atwater who takes the whole thing seriously asks Voight to send him to the prison and work on the man. Voight sends him in as a con along with Ruzek posing as a con too and Antonio as a guard. Voight and the others try to find the shooter. Platt asks Roman and Burgess to take some kids who are explorer candidates on a tour. But they ditch them and steal the Commander's car. Platt admits they are actually youth offenders whom a judge Platt knows, was hoping can be helped.