United in the face of peril, the brave firefighters, rescue squad members, and paramedics of Chicago Firehouse 51 are pulled apart by issues beyond their control in the red-hot fifth season. Firehouse Lt. matt Casey and Gabriela Dawson work to build a safe home for their growing family, even as their life-saving jobs demand their full attention. Rescue Squad Lt. Kelly Severride risks it all, and faces the consequences, while the crew confronts monumental changes.