by Charles Sheffield

In this sequel to COLD AS ICE, mathematician Alex Ligon has developed a population model that predicts the extinction of the human race will happen in less than one hundred years. Elsewhere, the Search for Extraterrestrial Intelligence continues in spite of years of no success. The convergence of an alien signal with an antique weapons collector's astonishing find may prove to foreshadow the apocalyptic prediction of Ligon's model.