Aliens are coming to Yellowstone Global Park. In order to protect its delicate ecosystem, the park has been closed to the public for a quarter of a century. But the fortifications that keep the public away from the bison and the geysers are perfect for keeping the arriving aliens-the Stracahn-away from humanity. Solomon Brooks lives on the edge of the park, but he has never been inside. Outside the park's energy barriers, bitter land wars threaten to tear human society apart. Sol seeks refuge from the conflict by volunteering to work with the aliens inside Yellowstone. There, he meets...