Chicago P.D. Season 4 Episode 17 : Remember the Devil

After being tipped off about a woman running barefoot through the woods, Intelligence is led to a kidnapping victim locked up in a shipping container. The bizarre scenario leaves Voight questioning the legitimacy of the case, and sends the team on a twisted trail to get to the bottom of it. Meanwhile, a former relationship of Halstead's comes back into the picture, much to the surprise of Lindsay.