Alex Weisman

Firehouse 51 responds to the scene of a harrowing blaze that endangers the lives of many, including one of the Chicago family.

The situation turns dire when members of Firehouse 51 are split up and reassigned, while Severide toils over an important decision.

The shooting of a child in their neighbourhood forces Cruz and his brother to think about the gang, Isabella gets Mills to dress up for a gala, Casey feels sad he will be seeing Dawson less, and Shay gets in deeper with Devon.

The firehouse crew goes to the scene of a railroad accident; Boden must make a big decision about his future; Severide learns more about the woman he saw with his father; Shay and Dawson continue to butt heads.

Dr Rhodes tends to two injured aeroplane stowaways, but their treatment becomes complicated when the Department of Homeland Security arrives.

A mass shooting at a cinema inundates the hospital with gunshot victims, including the shooter. Dr Rhodes faces a crisis of conscience.