Big Friends Big Enemies

S4 E410/12/16
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After a 16-year-old rapper is shot at his own concert, P.D. tracks social media in the hopes of preventing an all-out gang war; meanwhile, Atwater worries that his younger brother is at risk of being affected by gang violence.

All Cylinders Firing

S4 E310/05/16
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After Platt is brutally attacked by a mysterious assailant, Voight and the rest of P.D. work around the clock to find the culprit and uncover the motive behind the vicious assault.

Made a Wrong Turn

S4 E209/28/16
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Police-civilian tensions create obstacles for P.D. as Voight and the team search for a missing woman in a high-crime neighborhood; Halstead and Lindsay take a big step in their relationship.

The Silos

S4 E109/21/16
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After Voight is suspected in the murder of his son's killer, Lindsay becomes the target for intense questioning; Burgess gets a new partner with an intriguing history.