Thomas Gaitsch

Dawson attempts to help her brother Antonio unravel the details of his drugs-and-gang investigation, and goes behind his back in turning to an unlikely source for assistance. Casey and his mother, Nancy struggle with their new relationship. Meanwhile, as a favor to Lieutenant Whaley, Severide visits someone important from his past, while Herrmann and Otis learn some hard truths about their "silent partner" in the bar.

A series of brutal home invasion robberies finds the team paired with Det. Borkowski, an old friend of Ruzek's, to work the case.

Nurse Lockwood (Marlyne Barrett) gets arrested for refusing to violate hospital policy and draw blood from a suspected DUI patient without his consent. Dr. Halstead (Nick Gehlfuss) discusses with his lawyer the severity of the pending lawsuit against him. Elsewhere, Dr. Manning (Torrey DeVitto) and Sharon Goodwin (S. Epatha Merkerson) deal with a single mother and her 6-month old, but when the baby's injuries come into question, concerns are raised. Meanwhile, Dr. Charles (Oliver Platt), who is dealing with some personal issues, and Sarah Reese (Rachel DiPillo) attend to a patient that was hit by a car, but suspicions abound when they dig deeper.

Ruzek reunites with an old colleague to take down a crime ring but when things don't add up, Voight and Burgess do some investigating of their own.

Ruzek's search for the daughter of an old family friend leads the team into a serious drug investigation. Burgess and Ruzek struggle to move on from the emotional aftermath of Makayla's abduction.