-- To Each This World A trio of Humans must work with their mysterious alien allies to rescue any descendants they can find on those worlds. Something is out there, determined to claim the cosmos for itself, and only on Earth will Humans be safe. Or will they? The challenge isn't just to communicate with your own kind after generations have passed. It's to understand what isn't your kind at all. And how far will trust take you, when the truth depends on what you are?