The crew of the Artemis has escaped the nightmare of Paradise-1, but at great cost. Parker is gone. Petrova's past continues to haunt her. Worst of all, Erebus--a timeless entity of pure darkness--has been released from its prison. Now it's headed for Earth. Petrova must rally her crew for one final mission. Somehow, they must find a way to unite the disparate factions of the solar system--the United Earth Government, the Lunar colonies, and the outer planets--and find a way to stop Erebus. The fate of humanity--and the galaxy--is in their hands.