After the ice age returns civilizations and nations break down. A gunman is about to be executed when he is pardoned - conditioned on him killing someone. However, he ends up befriending his target instead but trouble doesn't end ...

A group of humans arrive on Sirius 6-B to investigate an SOS signal sent out from the planet, which has been supposedly deserted since the destruction of the man-made weapons known as "screamers." Once the squad arrives, they find...