When everything she's ever known is a lie, one young woman must make a choice that could change the course of history.

Glade Io is torn between two worlds. She's a trained killing machine—selected by the ruthless Authority to be a Datapoint, a tech-enabled agent of the state who eliminates threats to the human colonies throughout the solar system in the Culling. But her time among rogue colonists called the Ferrymen has convinced her that The Authority has far more sinister plans in store, and all the justifications they fed to her are lies. Vowing to help the rebels fight The Authority from the inside, Glade must sabotage a captured Ferryman ship that The Authority is planning to use to attack the Ferrymen stronghold.

Though Glade is drawn to the brave leader of the Ferrymen, Kupier, she has older loyalties as well. Her friend and mentor Dahn Enceladus is charismatic and ambitious, but although Glade cares for him, she can no longer trust him. Her younger sisters are also in danger of facing Datapoint testing, and now she's being forced into an upgrade she cannot refuse. But help is about to arrive in an unlikely form: a ghost from her distant past.