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.

Darden's widow publicly blames Severide for her husband's death and Casey makes a decision about his future with Hallie.

Detective Voight plays with fire to get Lieutenant Casey to retract his statement and paramedic Dawson's career is close to flatlining.