Underworlders

The world has just gone through a dreadful war. Almost all of the land is gone, from immense bombings and the remaining land is radioactive. The people left who managed to get underground are called, Underworlders and they have created a new society in fear of radioactivity.
Eden has grown up in this society of fear, hardship, and chaos but she is different. She is smart, clever, and exceptional at anything releated to science or logic.
What will Eden do when she has to make the hard decision, die or live in fear?