Reeling from the latest attack by a mysterious enemy, the Quatra Fleet Academy is finally admitting students from every planet in the solar system after centuries of exclusivity.

Hotshot pilot Vesper, an ambitious Tridian citizen, dreams of becoming a captain - but when she loses her spot to a brilliant, wisecracking boy from the wrong side of the asteroid belt, it makes her question everything she thought she knew. Growing up on the toxic planet Deva, Cormak will take any chance he can get to escape his dead-end life and join the Academy - even if he has to steal someone's identity to do it. Arran was always considered an outsider on icy Chetire, always dreaming of something more than a life working in the mines. Now an incoming cadet, Arran is looking for a place to belong - he just never thought that place would be in the arms of a Tridian boy. And Orelia is hiding a dark secret - she's infiltrated the Academy to complete a mission, one that threatens the security of everyone there. But if anyone finds out who she really is, it'll be her life on the line.

These cadets will have to put their differences aside and become a team to defend their world from a cunning enemy - but the danger might be lurking closer to home than they think . . .