Begins with the narrator fleeing a domestic argument and walking to the top of a hill to gaze at the stars. He finds himself "astrally projecting" and soon discovers another world, populated by roughly humanoid creatures. After telepathically joining with a sympathetic native, he explores the world and its troubled civilizations. After disaster and folly doom the planet, the narrator and his guide find themselves whisked to another troubled world, and another, and so on, each populated by stranger and stranger creatures with more and more esoteric mental and spiritual natures. After several millenia, a true galactic civilization arises and begins organizing itself into a Galactic Mind to root out the deepest questions of existence.