Bad heroin is causing overdoses in Chicago, and Intelligence is a man down with Voight suspended. Antonio takes charge, but Ruzek undermines his authority.

After Gordon is shot in an attempt to establish a cease-fire, he hallucinates a trial for his life that could have deadly real consequences. Meanwhile, Ivy returns and puts her…

Ben forms an unlikely partnership with Vance in a high-stakes race to locate the missing passengers of Flight 828. Meanwhile, Michaela helps a suicidal passenger who believes he is the…