Set on a futuristic Moon populated by humans and white hummingbirds, the story follows Hieronymus Rexaphin, a teenager born with lunarcroptic ocular symbolanosis (LOS). This condition grants him eyes of a forbidden fourth primary color that causes hysteria or physical collapse in those who see it, forcing him to wear utilitarian goggles by law. The narrative traces a series of illegal encounters, beginning when Hieronymus removes his goggles for Windows Falling On Sparrows, a tourist from Earth, and later for his classmate Slue, who shares his condition. Their interactions reveal that the Lunar government suppresses these individuals to exploit their unique vision for piloting Mega Cruisers. As Hieronymus and his friends flee from the obsessive Detective Schmet, they discover that the forbidden color is a natural lunar phenomenon capable of being harnessed. Ultimately, the text explores themes of enforced blindness, political control, and the transformative power of human connection in a sterile, neon-lit society.