The story of fearless young cop and galactic pilot, Ash Harper, who has her glittering career ripped away from her after being wrongly convicted of a treasonous crime and exiled to a distant prison colony.

London police officer DC Hana Li is escorting Dr Matthew Nolan back to Beijing where he has been accused of a crime. However, on board flight 357, she finds herself embroiled in an escalating conspiracy and a growing number of murders.