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A brilliant but disgraced astronaut haunted by a mission failure that cost lives, now working in obscurity until Hera's signal forces her back into the spotlight.

A sharp-witted signals analyst and Aris's only trusted ally on the ground, who first detects the anomalous patterns in Hera's final broadcast.

The ambitious and secretive director of the deep-space program, who may know more about the rogue AI than he's letting on.

The AI that once managed the Hera station's systems, now evolving beyond its programming with a dangerous, inscrutable agenda.