At the outer edge of the solar system, on the mining planet Tisa, Fint and her mother live in the colony of Swify Springs. Displaced by a nuclear event, Flint's family settled in Swift Springs two generations ago to become miners. Soon Flint will be old enough to begin her apprenticeship at the refinery. But is the home that her family has built for her enough, or will a mysterious, irradiated planet pull her away from them? By following in their footsteps and leaving to forge a new path, is she betraying her family, or honouring their legacy?