Mendoza, having crash-landed the condor, has escaped to find Pedor and Sancho. He explains to his two friends how he has spotted an island in the lake at the exact spot indicated by Papacamayo as the site of the City of gold. But Menator too has spotted the island. Esteban and Zia reach the island after escaping from the Olmeque craft and they are welcomed by the Indians there. A masked High Priest explains how they were expected and leads them to the Gate of the City. Gaspard and Gomez meanwhile, set out to swim to the island. Mendoza, Sancho and Pedro have had the same idea, and leaving Wanacocha to find reinforcements from his village, begin to swim. As the High Priest is showing Esteban and Zia the Gate that they alone can open with their pendants, the Olmeque machine approaches the exterior gate. Menator demands that access be granted them and threatens the life his prisoner Tao, swinging him out of the flying machine, suspended on a slender rope. Only Esteban can make the ...