After six months exploring the terrifying wide-open spaces of the outer world and learning the mysterious magics of the gunslingers, the savage warrior woman Calah, returns to the inner Earth. To reclaim her husbands and children she must face the tribal High Priestess and her horde of fanatical followers, but only if she can slip past packs of ravenous dinosaurs and the deadly race of silent serpent men from the Forbidden Caverns.

This book follows the characters first introduced in Gunmen of the Hollow Earth.