In 1965, a mysterious beam of blue light descended from space, illuminating Northern California. This extraterrestrial beam possessed strange powers, causing those it touched to either die, go mad, or gain a unique, extraordinary ability. This newfound power represented the full actualization of human potential, bestowing strengths, understandings, and communication abilities far beyond normal human capacities. Those affected by the light were soon dubbed "Blues" and were segregated from society due to their superhuman abilities. United by their shared experiences, the Blues began searching for their purpose in the universe. However, an evil force known as the "Gray Man" soon emerged, setting the stage for a battle between good and evil.

The Gray Man, originally Horace LaFontaine, was a character struck by the light at the moment of his death, revivified as a demon with a mission to annihilate the Blues. Once the Blues discovered their nemesis, they took refuge in the forests outside Northern California. Despite their efforts to hide, the Gray Man learned of their location through inside sources. Determined to confront their enemy, the Blues decided to declare war on the Gray Man.

This epic battle, which takes place at the novel’s climax, showcases the Blues utilizing their extraordinary powers to ultimately destroy the Gray Man. After their victory, the Blues settled into small cities in Northern California, integrating and living normal lives alongside the other residents of California.