Dr. Choi treats a teen mother who abandoned her newborn baby in an alley, as the staffers must make difficult decisions about the teen's future. Also, a hypochondriac with chest pains is treated, as is a patient suffering from possible dementia.

Dr. Halstead jeopardizes his career when he goes against a family's order regarding a terminally ill cancer patient. Meanwhile, April and Dr. Reese treat a homeless man, and Choi's personal issues emerge while caring for a bipolar patient.

A 9/11 hero is treated, but an unforeseen medical problem arises. Meanwhile, Sarah contemplates which hospital to select for her residency; Dr. Choi cares for an injured teen hockey player with a demanding father; and Halstead and Manning clash.

Dr. Rhodes and Dr. Choi clash over the final decision made by a dying patient. Meanwhile, a pending lawsuit against Dr. Halstead moves forward, and doctors race to save a patient with a misdiagnosed flesh-eating bacterial disease.

Nurse Lockwood gets arrested when she takes a stand. Meanwhile, Dr. Halstead deals with a pending lawsuit against him; a baby's injuries come into question; Dr. Charles faces personal issues; and suspicions rise about a patient who was hit by a car.