Wool introduced the world of the silo. Shift told the story of its creation. Dust will describe its downfall.

The residents of Silo 18 have a new mayor and the chance of a new beginning. But just as they regain their footing, their gravest threat emerges: Silo 1, and the men who brought Earth into ruin. But power, politics, and the survival of the human race are complex. Could it be that the very people who destroyed the Earth are the ones who mean to save it?