Red Denver, one of several successful communities in Usona, post-Blast America, has thrived because of OldWorld machinery and a strong community government. With his past behind him, Reho has made a new life for himself in Red Denver. Until Soapy, a local crime boss, starts a chain of events that leads to a climatic final face-off between Reho and one of the genetically-modified warbeasts designed by the Hegemons - an alien race determined to see humankind go extinct.