Seventy years ago, the world ended in chaos. Portals appeared on Earth, forcing everyone to make a choice: enter or die. However, if they managed to survive through all twelve planets in the system, they would be allowed to return home. Humanity fought bitterly and, in the end, succeeded, but the cost was high. Nate lost everyone he's cared about, and after stepping through the final portal, he makes a shocking discovery. Earth...