Land of Terror — Edgar Rice Burroughs

Disaster threatens the mighty Empire of Pellucidar. The terrible warrior-women of Oog hold David Innes captive; his mate Dian the Beautiful is a prisoner in the capricious clutches of the eccentric Jukans. A ghastly death on the sacrificial altar of the hideous Ogar, or at the mercy of savage animals and cruel men, awaits both of them, for the Sarians and their marvelous weapons are powerless to help.

David Innes, Emperor of Pellucidar, must survive terrifying perils before he can rescue his mate and regain his power.