Tarzan had been delivered into the hands of the dreadful priests of Opar. La, High Priestess of the Flaming God, had saved him once again, driven by her hopeless love for the ape-man. Tarzan fled with her into the legendary Valley of Diamonds, while Jad-bal-ja, his faithful golden lion, followed. and behind, Estaban Miranda who looked exactly like Tarzan plotted further treachery.