Josh and three other campers at Simon Lake are high up on a mountain when an earthquake hits. The rest of the camp is wiped out in a moment - leaving Josh, Derrick, Brooke, and Shannon alone, hundreds of miles from the nearest town, with meager supplies, surrounded by dangerous Alaskan wildlife.

After a few days, it's clear no rescue is coming, and distant military activity in the skies suggests this natural disaster has triggered a political one.

Josh and his fellow campers face a struggle for survival in their hike back home - to an America they might not recognise.