Emotions flare during the fourth season of this red-hot drama about the brave firefighters, rescue squad members, and paramedics of Chicago Firehouse 51. As firehouse Lt. Matt Casey (Jesse Spencer) deals with the fallout of his undercover work and Rescue Squad Lt. Kelly Severide (Taylor Kinney) struggles with a demotion, personal matters threaten the focus needed for the crew's daily life-and-death decisions. From Primetime Emmy Award-winning executive producer Dick Wolf (Law & Order) comes all 23 episodes uninterrupted for high-intensity viewing.