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Summary
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.
Episode Guide
Season 01
Season 02
Season 03
Season 04
Season 05
Season 06
Season 07
Season 08
Season 09