Alex Henderson

Dr. Choi (Brian Tee) and Dr. Halstead (Nick Gehlfuss) face off over how to treat a patient with stroke symptoms while Dr. Manning (Torrey DeVitto) treats a young boy who fell in the river and watches the family turmoil unfold. Meanwhile, Dr. Rhodes (Collin Donnell) examines the man who saved Dr. Manning's patient and emphasizes the importance of learning from your mistakes to Dr. Reese (Rachel DiPillo). S. Eptha Merkerson, Marlyne Barrett, Yaya DaCosta and Oliver Platt also star.

A group of robbers kill a security guard who was a former police officer and who, before his death, used the APB app. Meanwhile, Gideon redesigns a feedback chair – previously utilized in the aerospace industry – for use in the investigation room, and Murphy learns that her ex-husband, Assistant State Attorney Scott Murphy (guest star Michael Pearson), may be watching them.