
As the firefighters, rescue squad and paramedics of Chicago Firehouse 51 forge headfirst into danger, the choices they make can mean the difference between life and death; but from the relentless pressure of saving lives, an extended family is forged; led by Chief Wallace Boden, Matthew Casey, Kelly Severide and the others know -- when it's go time, Firehouse 51 lays it all on the line for each other; this high-octane drama from Executive Producer Dick Wolf offers an edge-of-your-seat view into the lives of everyday heroes committed to one of America's noblest professions.

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A call takes a bad turn when Brett witnesses a murder while aiding a victim who has a leg wound; a restaurant fire has people trapped inside a vault; Mouch gets cold feet about his upcoming wedding.
Severide is led to reexamine a case from the past while he investigates the discovery of a baby's body in a chimney; with election day nearing, Casey prepares for another confrontation with Alderman.
Chief Hawkins goes above and beyond to help Brett and Violet with a problem; Kidd pursues an open lieutenant position; a blast from the past asks Mouch and Herrmann for a favor.
Following an injury in the aftermath of an industrial fire, Severide and Seager work together to investigate an anonymous tip; Kidd searches for the right person to fill the open spot on Truck 81; a possible new recruit to 51 gets tested at a call.