
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.

Severide is accused of sexual misconduct; Casey starts to find satisfaction in his personal life; Dawson and Mills face challenges as they try to take their relationship to the next level; the squad faces a harrowing building collapse.

Lt. Casey must work with Voight and the Intelligence Unit; Shay grows increasingly excited about the prospect of motherhood; everyone comes together to support the opening of Molly's.

The squad must help defuse a volatile situation at the jail; Shay continues to be hopeful about motherhood; Herrmann's wife goes into labor; Mills and Dawson face important decisions.

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