Wool by Hugh Howey (Paperback)

In a ruined and toxic future, what remains of humanity lives in a giant underground silo more than a hundred levels deep. The rules are strict, and the worst crime of all is to say you want to go outside, because those who do are sent out to clean the sensors and never return.

When the sheriff breaks that rule, an engineer named Juliette is pulled from the depths of the silo into a mystery that could reveal the truth about their world. The first book of Hugh Howey's bestselling Silo saga and the basis of the hit series Silo, Wool is a gripping, claustrophobic thriller for every science fiction fan.