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When Kelton is found murdered, Voight’s grudge against the mayor-elect puts him under suspicion; Upton and Halstead want to prove their sergeant’s innocence, but the more evidence they gather, the closer they come to doing the opposite. When Atwater goes undercover in a drug syndicate, he learns there may be more to its kingpin than meets the eye; Halstead tries to join Atwater undercover, but finds himself at a disadvantage. After a botched carjacking turns out to be something much bigger, Voight’s unit goes toe-to-toe with a smart drug kingpin who only works with women. New recruit Vanessa Rojas struggles with the transition from undercover to Intelligence.
After zeroing in on a suspect responsible for bioterrorism, the P.D. prepares to undertake their biggest manhunt yet. Upton is torn between helping track down the perp and providing emotional support to a scared young girl who needs her. A murder in a Bulgarian neighborhood results in a challenging investigation when locals won’t talk to police. Ruzek has a clash with a patrol officer.