A troubling, prophetic dream plagues retired army officer John Anderson, encouraging him to prepare for an unknown disaster. When he hears of seismic activity in Yellowstone National Park, John realizes what's coming: the Yellowstone Caldera is about to erupt. In the hectic days before the eruption, John tries to warn family and friends with varying success. Although he convinces his wife and children, others dismiss him as a nut-job survivalist...