Eric C. Lynch

Thirty Balloons. Atwater and Burgess must keep their new patrol car in mint condition, the Intelligence Unit uncovers drug smuggling, Voight's behavior toward Lindsay drives her right where he doesn't want her, tensions rise between Olinsky and Ruzek.

Defcon 1. Severide is convinced he knows the arsonist's identity.

Win Loss. Drs. Manning and Rhodes suspect that two separate cases involving sick babies may be connected, a homeless patient's upbeat disposition enlightens Drs. Halstead and Charles, Dr. Choi and a Navy corpsman deal with the toll of gang violence.

With Special Agent Alden Parker still on the run with his ex-wife, the team investigates who from his past might have a personal vendetta against him in hopes of clearing Parker's name.

When the only witness to the rape and murder of a young man gets killed, the team suspects that someone was paid to take the victim out. Antonio receives a job offer from the state attorney.

Goodwin faces the psychological aftermath of her attack. Ripley has a patient with helicopter parents. An ED staffer makes a mistake that may cost them their job.