Suppose Earth is hollow, like a tennis ball. And you're weightless in there! The wondrous Hollow Earth holds jungles, seas, native tribes, flying pigs, killer nautiluses, giant ants, and live flying saucers. Godlike sea cucumbers at the Hollow Earth's core illuminate the great spherical space with branching rays of pink light. In The Hollow Earth, our young narrator Mason Reynolds leaves his farm, accompanied by Black Otha. He befriends the dissolute Edgar Allan Poe, and falls through a thousand-mile hole in the ice of Antarctica with Otha. Astounding adventures ensue. Return to the Hollow Earth kicks off during Gold Rush San Francisco, Mason and his pregnant wife Seela embark on a return voyage to the Hollow Earth with, once again, Edgar Allan Poe, riding a balloon through a vast maelstrom at the North Pole. The god-like sea cucumbers at the Earth's core have a startling plan. When Mason and Seela return to the Earth's surface, they're in modern day Santa Cruz, California.