The River runs through the galaxy like a road, connecting all the planets.

In the solar system of Spectra, a young emperor fights to rekindle an ancient alliance that can stop a dark cycle of history.

And on a colorless planet, a willful schoolgirl catches sights and sounds from other worlds when she paints.

More than anything, Sabel wants those places to be real-until the night an arrogant boy walks through her painting. She learns that she is a Riveter, one who can create portals and see visions in the River between worlds. Her uninvited guest warns her not to make any more portals, or she will incite dangerous enemies.

Sabel refuses to stay in the dark, a choice that sends her running for her life, with more questions than before. Why was her planet cut off from the rest? And what made the Riveters so rare?

The answers await in Spectra, a world where men and women wield all the colors of the rainbow. But the truth goes deeper than Sabel ever wanted to see, revealing her deepest fear-that she may never truly belong anywhere.