Master of the World is a science fiction novel by Jules Verne, published in 1904. It is a sequel to his earlier novel Robur the Conqueror and follows the exploits of a mysterious inventor named Robur, who creates a powerful, all-terrain, all-purpose vehicle capable of dominating air, land, and sea. The novel is a reflection on technological power and its potential for good or evil.

The story is set in the United States, where strange natural phenomena and mysterious sightings spark concern. John Strock, a government investigator from Washington, D.C., is sent to investigate unusual occurrences near the Great Eyrie, a secluded mountain in North Carolina. Locals report seeing flashing lights, hearing strange noises, and observing unusual activity, which Strock suspects is linked to some form of advanced technology.

Strock's investigation leads him to the discovery of Robur, a brilliant but megalomaniacal inventor. Robur has created an extraordinary machine called the Terror, an advanced vehicle capable of transforming into an airplane, a submarine, and a car. With the Terror, Robur has become a "master of the world," with the ability to traverse any environment and evade capture. He uses his invention to spread fear and demonstrate his dominance, believing that his superior technology gives him the right to rule over others.

Strock tries to track down and stop Robur, leading to a tense pursuit across various terrains as the Terror showcases its incredible capabilities. Despite Strock's efforts, Robur continues his dangerous mission, viewing himself as the rightful ruler who should control the world through technological superiority. In the end, however, the story concludes with Robur's downfall. During a storm, the Terror crashes, and Robur disappears, his fate left uncertain.