The Hitchhiker's Guide to the Galaxy is a humorous space thriller mystery book written by Douglas Adams. It follows the misadventures of Arthur Dent, an ordinary human who is swept off Earth just before its destruction to make way for a hyperspace bypass. Arthur embarks on a journey across the galaxy, encountering eccentric characters, interstellar bureaucracy, and the ultimate question of life, the universe, and everything. With its witty writing style, absurd humor, and imaginative world-building, The Hitchhiker's Guide to the Galaxy is a beloved classic in the genre.