Mia Park

Lt. Casey must work with Voight and the Intelligence Unit; Shay grows increasingly excited about the prospect of motherhood; everyone comes together to support the opening of Molly's.

The city prepares for a tornado; Brett is forced to go to Boden about Chili's erratic behavior; Otis asks Dawson for help with his women trouble; the Department of Homeland Security asks Severide for assistance with a suspicious home.

Dr. Choi is tested when an erratic patient takes drastic measures; Dr. Manning questions the circumstances behind a young boy's broken wrist.

April and Dr. Halstead can't agree on how to treat a homeless alcoholic with a broken leg; Dr. Manning realizes her wedding ring has gone missing; two elderly women with the same symptoms are linked in a surprising way.

Dr. Manning rushes to save a boy who has a life-threatening case of the flu; April suspects Dr. Choi's sister of stealing opioid pain killers; Dr. Rhodes and Dr. Bekker disagree over the best treatment for a cardiac patient who is 21 weeks pregnant.

Goodwin is forced by the hospital board to implement new guidelines that cause headaches for the doctors; Dr. Rhodes and Ava continue to compete in the operating room; Dr. Charles and Dr. Reese are surprised by a patient's theory about his sickness.