rom the award-winning author of Station Eleven Who could you sacrifice to protect the future? Lives separated by time and space have collided, and an exiled Englishman, a writer trapped far from home, and a girl destined to die too young, have each glimpsed a world that is not their own. Travelling through the centuries, between colonies on the moon and an ever-changing Earth, together their lives will solve a mystery that will make you question everything you thought you knew to be true.