Four children are left behind in their underground home while their parents and the others leave to see if the surface is safe again after The Disaster. Adapting to live underground makes the surface dangerous for them, and they have to find cover fast. Can they work out how to work together before ...

Four children are left behind in their underground home while their parents and the others leave to see if the surface is safe again after The Disaster. Adapting to live underground makes the surface dangerous for them, and they have to find cover fast. Can they work out how to work together before it's too late?