After a dimensional fracture scatters humanity, sixteen-year-old Cassi wakes in Cimerrion, a world where people from Earth are seen as threats. Assuming a new identity-Callasandra-she is forced into a state-run training camp where every move is watched. When a fellow student uncovers her secret, he draws her into the resistance-where survival means risking everything, and one misstep could make her-and anyone who dares to help her-disappear.