In a flash, the United States of America is sent back to the Stone Age. In a blackout-plunged New York City, Kimberly, her brother Collin, and friends Becky and Mike race to their family's Kentucky homestead. Facing a collapsed society marked by chaos and violence, their journey tests their endurance against ruthless dangers. At the farm, with no power or communications, she must rescue her friends from the chaos engulfing the nation.