Tarzan confronts raiders and pursues danger into the Ghenzi Mountains, where an isolated community descended from ancient settlers has developed a violent and distorted society. Lady Barbara Collis and other travellers are caught in the conflict, forcing Tarzan into another rescue mission.
Aeroplanes, expatriate travellers and armed expeditions place the framing story firmly in the interwar period. Beyond that recognisable world, the Ghenzi Mountains conceal another of Burroughs's isolated societies, where Tarzan's rescue mission becomes a confrontation with fanaticism, captivity and violence.
