Wool introduced the world of the silo. Shift told the story of its creation. Dust will describe its downfall. Juliette, now mayor of Silo 18, doesn&;t trust Silo 1, especially its leader, Donald. But in the world of the Silos, there is no black and white &; everything is shades of gray. Donald may not be the monster Juliette thinks he is, and may in fact be key to humanity&;s continued survival. But can they work together long enough to succeed?