In the world of Shattered Horizon, Man is back on the Moon and the companies that took him there are reaping huge profits. Their greed soon leads to the largest mining accident in history, which then throws billions of tons of rocky debris into near-Earth space. Fragments of the Moon settle around the Earth and become known as the Arc. With Earth surrounded by debris there's little chance of rescue or return. Survivors on the Moon are forced into conflict with those trapped on the battered International Space Station. Control of the arc means the difference between survival and death in the cold of the moon.