A young adventurer descends into the Earth to explore a deep mine, goes even deeper into an unexpected cave, and soon finds himself trapped in a strange underground world.

Here, there are landscapes of exotic beauty that enchant and stimulate the senses. Here, there are birds that sing a haunting and captivating music. Here is the monumental city of Vril-ya, the dominant race of amazing winged beings, humans who have evolved into superhumans, the culmination of Darwin's theory.

This race has discovered the terrifying and amazing energy of Vril, an energy force so terrifying that it can transform the darkness of the underworld into light, move the machines of an advanced civilization, expand the possibilities of the mind and the limits of life... and even destroy civilizations and lives.