I noticed this in the Kindle Store – in fact the version I got was an omnibus edition of the first five books of the series. I don’t read a lot of science fiction but the reviews were excellent and it looked like a good deal at £3.
The author describes it thus:
This is the story of mankind clawing for survival, of mankind on the edge. 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 residents who infect others with their optimism. Their punishment is simple. They are given the very thing they profess to want: They are allowed outside.
People live underground in the Silo, as the environment above ground is no longer safe for some as-yet-unknown reason.
This first story is about an hour’s read. It’s really good.
The Wool / Silo series reviews