In Discovering Pluto, Dale P. Cruikshank and William Sheehan recount the grand story of our unfolding knowledge and exploration of Pluto, its moons, and the outer Solar System. They explain the efforts of scientists, mathematicians, and researchers over the centuries to understand the outer Solar System, leading to the discovery and detailed exploration of Pluto as the premier body in the Kuiper Belt, the so-called third zone of our Solar System.