Commander Corliss and Roxanne Trent lead a criminal organization holed up in the Necrosis asteroid belt. No one can reach them there because no one knows how to enter except them - and an old fighter pilot Wilma forced out of service for medical reasons. When Corliss steals a quantity of nerve gas slated for destruction, reaching him becomes essential. He plans to release the gas in Earth's atmosphere: revenge for his maiming during a narrow escape from Earth forces. Wilma must ask a man she recently described as inadequate for help.