Many visitors to Yellowstone National Park don't realizethat the boiling hot springs and spraying geysers are caused by an underlyingsupervolcano, so large that the caldera can only be seen by plane or satellite.And by some scientific measurements, it could be overdue for an eruption.

For Alex, being alone for the weekend meansfreedom from his parents and the chance to play computer games and hang outwith his friends without hassle from his mother. Then Yellowstone erupts,plunging his hometown into a nightmare of darkness, ash, and violence. Alexbegins a harrowing trek, searching for his family and finding help in Darla,his travel partner. Together they must find the strength and skills to surviveand outlast an epic disaster