Fourteen-year-old Cassiopeia Brown has never belonged. Ridiculed, detested, and powerless, she’s an outcast even among her own kind — a goblin cursed with fiery red hair. So when the prophesied hero refuses to face the coming Moonfall — a magical cataclysm that will destroy the world — Cassie decides she’ll stop it herself, even if it means stealing his identity. Even if it kills her. With the eccentric elder Gaffer at her side, Cassie’s unlikely party grows to include Roland, a stone giant next in line for a crown he doesn’t want, and Elidi, a salamander girl hiding a secret of her own. Believing they’re aiding the child of the prophecy, the group hunts down five legendary moonlight artefacts. However, as the stakes rise, so too do the lies — and the resentful Cassie begins to fear the disaster might be her doing. With those fears, secrets long buried by the centuries surface, and a far darker truth becomes clear: not everyone wants the world to be saved.