Mt. Hood in Oregon erupts with terrifying power.

A shock wave slams into a helicopter carrying two volcanologists. A thousand-degree cloud of ash hurtles at hurricane speeds down the mountainside toward two hikers. Suffocating ash rains down on the campsite of a troubled teenager, stranding him and his family miles from help.

Massive mudflows rush down the river valleys and into 23-year-old Chad Keppler's small town. His lifelong dream is to be a firefighter, but after he fails the physical test, that dream seems about to slip away. But he can do this one thing: wade into the swirling, debris-filled mud, to prove to himself that he has the strength and courage it takes to save lives.