Flames that reach 50 meters high and burn hotter than 1,200°C are the subject here, part of the Deadly Disasters series on the planet's most destructive natural forces. Fire behavior experts and eyewitnesses explain how a wildfire generates its own weather, drawing in cooler air fast enough to spin off fire whirls with tornado-force winds over 80 kilometers per hour. The film moves through three case studies that show how differently wildfires can strike: the 2009 Black Saturday fires that tore through southeastern Australia, the 2018 Camp Fire that erased the California town of Paradise, and the 2019 fires that pushed smoke and risk across millions of people in Indonesia. Survivors describe what it was like to be caught inside the fire front, while scientists lay out the physics of combustion, fuel, and wind that make these fires so hard to predict or stop. The picture that emerges is of a hazard that keeps growing rather than one that is being brought under control.