Genghis, a biological robot, has spent 30 years striving to understand how his life has changed since the Nameless War that made him a hero to humans and Beings. His search for answers led to serving as a crew member on a Being transport starship which encounters a derelict space craft of unknown origin. He succeeds in boarding it and after he’s joined by four more Biots, the craft powers up and takes off with them as reluctant but curious passengers. They discover nine shutdown robots while exploring the ship, which brings them to a rundown space station orbiting a giant ball of molten lava. On board the station are a few more robots unable to operate the station.
The runaway vessel is followed by Being Galaxyships determined to rescue the Biots and discover the builders of the spaceship if they still exist. Among the pursuers is the cruiser Aurreol crewed entirely by Biots including the commander who has her own reasons for finding Genghis.
On the station, Genghis slowly pieces together the robot’s origin. They were built by a species that was nearly wiped out in attacks the survivors blame on their rivals. Genghis and Woodsy, a maverick robot, discover the rivals were attacked at the same time and set out to find the aggressor.