This book is fantastic. The story is of a post apocolyptic society that lives in an underground silo. It is alluded to, but never right out said, that nuclear war broke out and the people in this silo is the last of humanity. The book starts off with a cleansing....which means the people of the silo sends a condemed man/woman outside in what I would call a haz-mat suit to clean the cameras. Then they walk off and die. The book takes off from there and there are a few twists in the plot that even surprised me.