Like the maze Thomas and his new friends are trapped in, I Town is a crucible, a place of constriction and forced change. Runners searching the maze hope to find a way out of their situation or an explanation of why they’re in it, but the population of I Town doesn’t doubt what it’s supposed to do, how to do it, or why. They walk. They are the best and most reliable renewable energy resource, at least the ones who are big enough. The question is, how long can they keep doing it? When Jackson gives Shevi a novel from the days of the old Carbon Nation, she gleans a truth that shakes the certainty of her world and makes her question everything she’s ever been told.