On August 12, 1967, in Montana's Glacier National Park, the unthinkable happened: that same night, nine miles apart, there were not one—but two—fatal grizzly bear attacks.

After a sudden power outage, people awaken to a world cast in eternal night. Each trapped in their own isolated version of reality. Soon they are confronted by mysterious figures known as The Ushers, Who claim they can lead them to a place where a final irreversible choice must be made.