Forty thousand years ago, humanity fled a dying Earth. Traveling in massive arkships, these brave pioneers spread out across the galaxy to find a new home. After traveling thousands of light-years, one fleet of arkships arrived at Centauri, a dense cluster of stars with a vast array of potentially habitable planets. The survivors of Earth signaled to the remaining arkships that humanity had finally found its new home among the stars.

Thousands of years later, the Centauri Cluster has flourished. The original settlers have evolved into advanced beings known as Celestials and divided themselves into powerful Dominions. One of the most influential is that of the Crown Celestials, an alliance of five great houses that controls vast areas of Centauri. As arkships continue to arrive, the remaining humans and their descendants must fight for survival against overwhelming odds or be forced into serving the Crown Dominion.

Among those yearning for a better life is Finn, for whom Earth is not a memory but merely a footnote from humanity's ancient history. Born on one of the Crown Dominion worlds, Finn has known nothing but the repressive rule of the Celestials, though he dreams of the possibility of boundless space beyond his home.

When another arkship from Earth, previously thought lost, unexpectedly arrives, Finn sees his chance to embrace a greater destiny and become a Traveler--one of a group of brave heroes dedicated to ensuring humanity's future by journeying into the vast unknown of distant space.