In the first of the Chicago franchise from Dick Wolf, the everyday heroes of Firehouse 51 forge headfirst into danger no matter the risk, making the difference between life and death. Last season, the team faced a myriad of hardships – a fire truck collision, a rooftop helicopter crash and a car accident involving a close friend of their unit. But none of these challenges was as tough as losing one of their own – an unthinkable tragedy that affected each and every one of them. Through all the ups, the downs and the tensions both at work and at home, the firefighters, rescue squad and paramedics know that their commitment to each other is what keeps them alive.