NBC has released the episode synopsis & Promo for the 4th episode of Chicago PD season 9. Chicago PD season 9 episode 4 is titled “In The Dark”.
Chicago PD 9×4 “In The Dark” Episode Guide
When Upton and Ruzek answer an emergency call to an abandoned house, their investigation leads them down a dark path.
Chicago PD S9E04 “In The Dark” Episode Promo
Chicago PD season 9 episode 4 airs on October 13 at 10|9c on NBC.