The story follows a group of dedicated firefighters known as the Granite Mountain Hotshots, an elite crew tasked with tackling deadly wildfires. Led by their supervisor, Eric Marsh, the team trains rigorously to earn their certification as Hotshots, a designation that would enable them to confront some of the deadliest fires in the nation. New recruit Brendan McDonough, a young man with a troubled past, joins the crew and becomes determined to prove his worth to the team and himself. The camaraderie and brotherhood among the firefighters grow as they engage in grueling training exercises and respond to increasingly dangerous fire situations.

As the team responds to various calls and wildfires, their bond is put to the test against the backdrop of personal struggles and the perils inherent in their line of work. Tensions rise as they balance their personal lives with the relentless demands of firefighting. With each mission, their resolve strengthens, and they learn invaluable lessons about bravery, sacrifice, and camaraderie. Their ultimate test comes when they face one of the most catastrophic fires in recent history, a challenge that will forge their legacy and determine their fate.