Engineer Marius and his people are doing a roaring trade in satellite repair and reclamation from their base in Earth Orbit. But then an emergency call comes in. A dozen Chinese miners are stranded in a colony on the Moon. Can he and his apprentice Corinne build a ship and rescue the colony before a solar storm wipes them all out? See the solution they design, and follow them as they lead the colony to a new stage in humanity's spread into space.