Shattered Horizon is set 40 years from now. 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. A catastrophic explosion throws billions of tons of rocky debris into near-Earth space, its aftershocks threatening to tear apart the Moon itself.
Fragments of the Moon settle around the Earth and become known as the Arc, named after the dramatic shape they draw across the night sky. With Earth surrounded by debris there's little chance of rescue or return for the thousands of people stranded in space.
The International Space Agency's (ISA) astronauts and scientists trapped in the battered International Space Station are given the task of apprehending those responsible for the catastrophe. Weapons are among the last supplies sent to the station before the supply route from Earth is cut. The Moon Mining Cooperative (MMC) finds itself facing serious charges after only barely surviving the cataclysm. Cut off from Earth, they see the ISA as a threat to their very existence.
The two sides are drawn into an armed conflict. Desperate battles are fought over strategic locations and the scant supplies from Earth that make it through the shroud of debris. Control of the Arc now means the difference between survival and death in the cold of space.