Jack Casey used to be a hot-shot stock market whiz kid. After a disastrous professional decision, his life in the fast lane is over. He loses his nerve and joins a speed delivery firm which relies on bicycles to avoid traffic jams of San Francisco, is attracted to a fellow bicycler, Terri, and befriends Hector, a budding entrepreneur. Can Jack regain his nerve and his self-respect, and rebuild his life on a more sound basis?

Foreign agents from an unidentified nation clandestinely install radio and TV antennas in Rio de Janeiro devices that emit subliminal waves that alter the perception of the population. They aim to transform the people into an aggressive and imbecile mass, leading the country to chaos, allowing the government to be taken to usurp Brazil's natural wealth. A journalist, Carlos, accompanied by chemist Laura Leal, begins to investigate a series of facts and discovers those responsible for the disturbances.