Chaon Cross

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.

Tragedy strikes when a rescue attempt at a tenement building proves unsuccessful, leaving the men and women of Firehouse 51 affected by the loss of the victim.

Pete discovers that Chief Boden knows more than he's letting on about the death of his father and Shay decides she's ready to be a single mum.

Severide tries to prove his suspicions about the arsonist's identity, Casey gets accustomed to his new lifestyle, and Dawson goes on a date with a regular from the bar.

Lt Severide is targeted by an arsonist, Battalion Chief Boden clashes with Gail McLeod on the anniversary of Andy's death, Shay has suspicions, and Mari visits Mouch.