The sheaths are a race of alien beings made of pure energy. Possessing the rare power to awaken the dead and foresee the doom of worlds, they find themselves enslaved by another alien race known as the solids. The solids exploit the sheaths' gifts, feeding on the souls they reawaken, all of whom lived violent lives and are deemed unworthy of an eternal afterlife. When the sheaths detect that a place called Earth is in peril, they discover a way to finally free themselves from the solids. They enlist the aid of three humans to not only secure the sheaths' freedom but also save Earth from destruction. Meanwhile, the three chosen humans must engage in their own moral battle as they struggle to determine what they are willing to sacrifice for the greater good. As they strive to make the right decisions for themselves and humanity, the fate of the planet, the sheaths, and the entire universe hangs in the balance.