The unit scrambles to search for one of their own who is in grave danger.

Air Date: Wednesday, March. 9 (10:00PM – 11:00PM) on NBC.

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CHICAGO P.D. -- "Gone" Episode 915 -- Pictured: (l-r) LaRoyce Hawkins as Kevin Atwater, Jesse Lee Soffer as Jay Halstead -- (Photo by: Lori Allen/NBC)