With most of the squad still trapped in the warehouse fire, Chief Boden makes a risky last-minute decision to save them.

When Boden learns that the school fire in which his wife was trapped was not an accident, he pressures Severide and Casey to find the cause.

Lt. Casey butts heads with the new chief who fills in for Boden at House 51; Mullins has an unexpected surprise for Casey when he makes a risky move to stop a man from jumping off the building; Brett learns information about a friend.

While running a secret errand, Dawson finds herself trapped in a collapsed parking structure; pressure mounts on Casey as he begins taking on additional duties; Kidd grows increasingly skeptical of Hope.

Dawson and Casey struggle to communicate; Brett and Kidd compete for the affections of a hazmat officer; Otis, Herrmann and Mouch search for the source of a stench that's making life difficult at Firehouse 51.

Casey and Severide disagree on the best course of action following a time-sensitive rescue; Herrmann tries to entertain his daughter on "bring your kid to work day"; Dawson joins Brett on a spa getaway; Kidd's social life gets a boost.

The photographer whose pictures of Casey and Severide during a rescue make the front page of the newspaper chronicles a day-in-the-life story at the Firehouse.

The firefighters help the police track down a bombing suspect.

A domineering husband answers for his injured wife after Casey and Dawson respond to a car accident.

Otis and Kidd respond to a call involving a residential fire only to head into danger when gunfire goes off in the house.

The members of Firehouse 51 come to terms with one of their own being injured and deal with the temporary replacement.

Boden has a lapse in judgment in the aftermath of rescuing a young boy. Kidd struggles to win the approval of Severide's mom after a surprise visit and Otis takes on new responsibilities at the firehouse.

Casey and Severide assist the FBI with an undercover mission; Kidd tries to help Severide come to terms with recent developments.

Casey grows skeptical of Cordova when a large amount of money turns up missing at the property of Mexican drug cartel.

Boden and Severide receive a surprise package after saving a girl from a car accident.

Boden takes a big step in the pursuit of a major career decision. Kidd becomes increasingly distrustful of Renee's motives with Severide. Herrmann has trouble bouncing back after a tragedy.