When Upton and Ruzek answer an emergency call to an abandoned house, their investigation leads them down a dark path.

Air Date: Wednesday, Oct. 13 (10:00PM – 11:00PM) on NBC.

NUP_195128_0004.JPG

Picture 2 of 17

CHICAGO P.D. -- "In The Dark" Episode 904 -- Pictured: Jesse Lee Soffer as Jay Halstead -- (Photo by: Lori Allen/NBC)