Tarzan encountered Hawkes' party, where he was drugged and ended up in the hands of the Oparians. Queen La, who had come into disfavor with the high priest, felt she had nothing to lose by escaping with Tarzan through the only unguarded route—a path to the legendary valley of diamonds, from which no one had ever returned. There, Tarzan found a race of humans who were little better than animals in intelligence, being enslaved by a race of intelligent gorillas. With the help of his golden lion Jad-bal-ja, Tarzan used the natives to restore La to power. Before leaving he accepted a bag of diamonds for a reward.