There is a fine line that separates the world above from the dark underground - a line that maintains the division between the haves and the have-nots. It's either heaven or hell; ecstasy or despair. And for Casey Williams, this is something he is forced to learn. Roughly thrown into a crowded and dingy corral by Overseer Ross Vincent, this new member of the 'stock' is about to learn the truth about the "dark side" of life.