A physical workout turns mental for Severide.

The firehouse is tested to the limits when called to the scene of an epic railroad accident and Boden ponders his future.

The detectives work around the clock to find an abducted girl.

The search for a police officer's runaway daughter leads the detectives through an underground rave culture that caters to wayward teens.

The death of a teenaged boy exposes corruption behind the walls of an affluent school.

An investigation is launched when the team discovers the body of a government official.

Undercover police sting proves that Carmela Knight was the victim of a murder-for-hire plot.