WOOL, the debut novel by Hugh Howey, has a pretty interesting back story. It was first self-published as a series of short novels by Howey, and later picked up by a publisher and collected into the WOOL Omnibus. It is the story of a world so ravaged by a poisonous atmosphere that humanity has been relegated to living in a structure known as the Silo, a bunker that reaches 140 stories underground. Their only knowledge of the outside world comes in the form of images shown on screens transmitted by cameras lining the outside of the silo. These cameras are constantly under threat of being covered by grime, and need to be cleaned often. Cleaning, however, is a death sentence, and a job delegated to those to break the Silo’s laws, the most heinous of which is expressing a desire to leave and go outside.