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Tarzan, Lord Greystoke, at his estate in the heart of Africa, awaits the arrival of a company including his wife, her niece (Ruth Porter), Bradney (the overseer), and Ruth's fiancé. Weesimbo tells Tarzan of a mysterious city of diamonds from which he has escaped, and Tarzan, going to meet the caravan, arrives in time to drive off an attack by Esteban, an unscrupulous trader. When Tarzan goes on a hunting trip, Esteban and his men attack the unprotected estate, capture Weesimbo, and make a hostage of Ruth. Tarzan embarks on their trail with Jad-Bal-Ja, a pet lion. Cadj, High Priest of the Palace of Diamonds, is warned of the arrival and captures Ruth for sacrifice to Numa, lion-god. Weesimbo reveals to Tarzan the secret passage to the city; he rescues Ruth and after killing Numa is acclaimed as a new god. Esteban is killed by the lion, and all ends happily.