Humans have inhabited a deserted alien community on a desert planet. The original inhabitants left thousands of years earlier leaving the community behind. Earth's scientists discovered that the structures in the community could not be damaged or changed in any way. Even the most powerful lasers had no effect on them and the technology inside the city was far beyond anything Earth was capable of duplicating.

After a hundred years of studying the community, Earth decided to allow colonists to go and live on the planet. It was determined before the original inhabitants of the community left that numerous intelligent civilizations had been eradicated that were located close to the desert planet.

A new discovery of advanced alien technology was uncovered under one of the buildings in the community which caused Earth to send one of its best scientists to investigate. Along with one of the colonists, he finds there is a good possibility that the species that built the community were probably coming back...and soon. If it was this species that eradicated the ancient civilizations, then Earth and its other colonies were in danger of destruction.

p, li { white-space: pre-wrap; }