Dust: Book 3 of the Silo Series (Dust, 3) by Hugh Howey

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?

In Dust, the final book in the New York Times best-selling Silo trilogy, the choices that Juliette and Donald make could lead to salvation . . . or to the death of everyone on the planet.