Strange artifacts are found on a planet in the Centauri System during the first interstellar voyage.A second team of experts are assembled to find out what are the artifacts, who made them, and where are they now? What Tom and the others find is an ancient and dead civilisation, dead for 14,000 years Although the dead race, the Crintu are no longer around, they left a great legacy in the one surviving building, their history which holds a dreadful message for humans.