It's the year Mil. 215 on New Earth, a time where the humans have been split into two classes, labelled and branded for ever. The Helios, the class for the elite and The Selene, the class for the workers, miserable and underprivileged. Luna Bishop-Smith is a Selene, living in the poverty-stricken suburbs of London with her grandmother, mother and younger brother, Leo. With her family struggling to afford rent, bills and even sufficient food, Luna sets out to find a job. However, after a major incident, Luna discovers she is very much a diamond in the rough. She is heiress to a generous inheritance that will ensure her family's survival for years but in return, Luna must find her dad - a rogue criminal hiding in outer space and bring him back to Earth to be imprisoned forever. To do this, Luna must train at Camp Cosmos on Planet Ostridaea, to gain all the strengths needed to combat the perils of outer space. Strange things happen and Luna yearns to discover the truth. Who should she trust and which side should she choose?