Following the gutsy firefighters, rescue squads and paramedics of Firehouse 51. No field is more dangerous yet so exhilarating, but the personal lives of these men and women provide close competition.
Firehouse 51 deals with the aftermath of the capsized boat rescue; Gallo, Ritter and Violet discuss plans for a side gig.
When Ruzek accidentally ends up on an unauthorised undercover mission, he finds himself under investigation by the PD's new street deputy.
This episode concludes a story that began on `Chicago Fire' in which a huge charity run is targeted by bombers.
Ruzek's future with the unit is in question after a botched undercover job, a corpse is discovered in an SUV, and Lindsay and Halstead move forward with their relationship.