Wool: The Unraveling is the fourth of the written works in the Silo series by Hugh Howey. It was released on December 25, 2011.
Synopsis[edit]
There is a legend in their past of an uprising, a war they have learned about, but have learned nothing from. Nobody knows what went wrong. Nobody talks about what happened. Such are the silo taboos. Now, nearly two hundred years later, the people of the Silo will get a chance to learn more about that distant uprising. They'll get to start one of their own...