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.