Long ago, the astrophysicist Inigo began dreaming scenes from the life of the remarkable Edeard, who lived within the Void, a self-contained microuniverse at the heart of the galaxy. Inigo’s inspirational dreams, shared by hundreds of millions throughout the galaxy, gave birth to a religion: Living Dream. But when the appearance of a Second Dreamer seems to trigger the expansion of the Void—which is devouring everything in its path—the Intersolar Commonwealth is thrown into turmoil.

With time running out, the fate of humanity hinges on a handful of people: Araminta, now awakening to the unwelcome fact that she is the mysterious Second Dreamer; Inigo, whose private dreams hint at a darker truth; and Justine, whose desperate gamble places her within the Void, where the godlike Skylords hold the power to save the universe . . . or destroy it.