An explosion rocks Yellowstone. A strange disease begins to spread. A supervolcano threatens to erupt.And none of it was an accident.A reclusive Yellowstone park ranger is forced into action, teaming up with a beautiful woman from the CDC.Harvey Bennett isn't a trained killer, but he'll fight for what's right.And he'll do anything to take down the terrorists behind the attack.From Yellowstone across the American landscape, H...