The story, narrated by Howard Fornoy in the form of a personal journal, recounts the life of his genius younger brother, Robert. Bobby, a child prodigy whose adult interests led him to study a variety of scientific disciplines, discovered a chemical that reduces the aggressive tendencies of humans and other organisms. While doing sociological research in Texas, Bobby used crime statistics to create a topographic map which displayed a geographical pattern of violent crime. Examining the map, Bobby noted diminishing levels of crime centered on the town of La Plata. When he arrives to investigate, he finds that this town has never had any violent crime. Bobby is ultimately able to determine that the cause of the non-aggression is the presence of a chemical unique to the town's water supply, a phenomenon that is mentioned in (but had nothing to do with the causations of) King's earlier novel "It". Even minimal exposure to the chemical will calm an angry person or animal. Bobby isolates and reduces the chemical down to a concentrated form.