When Upton and Ruzek answer an emergency call to an abandoned house, their investigation leads them down a dark path.
Goodwin, Maggie and Marcel help victims of a hit-and-run accident. Halstead struggles to diagnose a patient with seizures. Asher and Archer clash with Jack Dayton.
With the future of Paula's health staring them in the face, she and Mike decide to take a giant leap in their relationship.
The contestants air their grievances after the release of the first show trailer; Wayne has a run-in with someone from his past.
A trip to Gabby and Justin's high school leads to an emotional reveal; Nick tries to stage an important conversation between Mike and Paula.