After zeroing in on the suspect responsible for the bioterrorism that’s gripping Chicago, the PD prepares to undertake their biggest manhunt yet. Upton is torn between helping track down the perp and providing emotional support to the scared young girl that needs her. Voight fears his team is being sent on a wild goose chase.
Elenco: Jason Beghe , Jesse Lee Soffer , Marina Squerciati , Patrick John Flueger , Laroyce Hawkins , Amy Morton , Elias Koteas , Jon Seda , Sophia Bush , Tracy Spiridakos , Brian Geraghty , Lisseth Chavez , Archie Kao .