The final shot features Halstead standing at his apartment door, staring at an exhausted Upton. This cliffhanger signaled a major shift for the couple, as their relationship was no longer built on complete honesty. Chicago PD spoilers: What happened in season 9 episode 4?
While working in the early morning hours, Upton and Adam Ruzek respond to an emergency call at an abandoned building known as the "death house". They discover a grim crime scene involving children, which sets off a high-stakes investigation to find a serial abductor.
Suspicious of the secret conversations between Voight and Upton, Halstead conducts his own investigation into the night Roy Walton disappeared. He eventually tracks GPS coordinates to the field where Roy's body was buried.
When Voight suggests that Halstead doesn't truly know the woman he is sleeping next to, Halstead reacts by punching Voight in the face. Themes and Impact