Following the death of a 10-year old girl the intelligence unit have one option to gain access to their suspect, go on the inside. Ruzek (Patrick Flueger) and Atwater (LaRoyce Hawkins) act as inmates to work the case from the inside. Outside prison, Voight (Jason Beghe) and Olinsky (Elias Koteas) follow-up on a good lead to answer some questions about the shooting. Meanwhile, Burgess (Marina Squerciati) and Roman (Brian Geraghty) show three boys around district thinking they are part of the Police Explorers program, only to realize that’s not quite the case.
Two teenage girls have gone missing and the team know the clock is ticking to find them. Halstead (Jesse Lee Soffer), Antonio (Jon Seda) and Lindsay (Sophia Bush) investigate a tenement which gives them a much needed lead. Voight (Jason Beghe) brings the father of one of the girls to district in order to get some honest answers.