The town of Knotty Pine is threatened with a grave danger, and this danger is so great that it could blow half the town off the map, and kill and injure hundreds of people. It's not a tornado or earthquake, it's not a flood, or a freight car loaded with ammunition. It's not a great fire, or an airplane out of control. So, what is this great danger which threatens life and property of almost every citizen in Knotty Pine?