A vibrant and emotional science fantasy about cousins trapped in mirrored worlds - the resplendent and verdant summer city and the ice-carved wastes of the winter city. For fans of Every Heart a Doorway and This is How You Lose the Time War.

Welcome to Jamie Pike's Fairharbour - a city stuck in perpetual winter, its windows and doorways bricked shut to keep out the freezing cold, its residents striving to survive in the arctic conditions.

Welcome to Esther Pike's Fairharbour - a city stuck in constant summer, its walls crumbling in the heat, its oppressive sunlight a relentless presence.

Winter and Summer alike, have both fallen under the yoke of oppressive powers, that have taken control after the cataclysm.

But both Fairharbours were once a single, united city. And in certain places, at certain times, one side can catch a glimpse of the other. As Jamie and Esther find a way to communicate across the divide, they set out to solve the mystery of what split their city in two, and what, if anything, might repair their fractured worlds.