Exploring a cave, Tom finds himself trapped when a series of earthquakes seal the cave entrance. Weeks later he pulls himself out. There is nothing to be seen for miles but ashes.
A forest fire?
He keeps walking until he finds a sign of civilization; thoughts of his wife keep him going.
But when he finds other people, he learns a terrible truth... The world as he knows it is over... destroyed.
He tries to build some good for himself, pull the world towards a proper new order, but he soon realizes that in a fight for survival he cannot do what he wants. What he discovers instead is something that will horrify and change him forever.