
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. 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.

Cruz's past comes back to haunt him; Severide prepares to teach an arson class at the academy; Mouch searches for a victim's next of kin.

Herrmann and Mouch prepare to take their officer exams; Cruz receives a chilling omen; Carver takes care of a dog after its owner is injured on a call.

Tensions run high between Casey and Herrmann after the firehouse responds to an apartment complex fire; after discovering something extremely suspicious during the call, Kidd and Severide do some investigating and get CPD on the case.

The probies take on their last day at Firehouse 51 when Kidd receives shocking news; Violet and Novak begin fundraising for the Joint Duty Program and receive a surprising donation.