When a powerful tornado tears through Nashville and endangers a country music festival, Captain Don Hart leads fire station 113 on a harrowing rescue mission. Meanwhile, the Hart family contends with the fallout when a long-held secret is revealed.

A tornado's path leads the Station 113 team to an intense rescue at a water tower. Ryan and his wife reach a turning point, while Dixie has an assignment for Blue. Cammie coaches a distressed teenager through her mother's childbirth.

Amidst multiple crises, Ryan steps up to lead Station 113. The team responds to a dangerous call of a child trapped in a trailer hanging off a historic Nashville bridge. Meanwhile, Blythe pays a long-overdue visit to Dixie.

Don and the 113 team respond to emergencies at a waterpark and a sorority house. Meanwhile, the crew puts Blue's skills and knowledge to the test as he trains for his firefighter exam, while Blythe digs into Blue's past.