Wool by Hugh Howey

The world outside has grown unkind, the view of it limited, talk of it forbidden. But there are always those who hope, who dream. These are the dangerous people, the people who infect others with their optimism. Their punishment is simple. They are given the very thing they profess to want: They are allowed outside.


This is great story-telling, with well-developed, complex, characters, believable world-building and a plot with lots of action.