The much-anticipated final instalment of the Wool trilogy. In a time when secrets and lies were the foundations of life, someone has discovered the truth. And they are going to tell. Jules knows what her predecessors created. She knows they are the reason life has to be lived in this way. And she won't stand for it. But Jules no longer has supporters. And there is far more to fear than the toxic world beyond her walls. A poison is growing from within...

In a ruined and toxic landscape, within a giant underground silo hundreds of stories deep, lives a society full of regulations they believe are meant to protect them. Then Sheriff Holston, who has unwaveringly upheld the silo's rules for years, breaks the greatest taboo of all: He asks to go outside. His decision unleashes a drastic series of events. His unlikely replacement - Juliette, a mechanic with no training in law, is about to learn how badly...