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Mine owner David Innes and inventor Abner Perry set out to test Perry's mechanical prospector and end up in the land of Pellucidar, five hundred miles below the Earth's surface, where they work to unite the warring humans of the subterranean world, and to defeat the reptilian Mahars.

When the Wind disappears, young windling Aria and her best friend gryphling friend Gwyn embark on a quest to bring them back, but when all the natural elements begin to vanish one by one, Aria realizes that there is a darker mischief at play.