While visiting A-lur, Tarzan learns of the appearance of some giant white apes. He goes to investigate and finds the apes and their captive, a white woman, Alice Jenner. He helps Alice escape and the pursuit of the apes is cut off by Alice's husband Paul, bearing a rifle.; Keeping his promise to return to Castra Sanguinarius, Tarzan witnesses the kidnapping of a Castra Mare tribune's son. Tarzan follows the kidnappers to Castra Sanguinarius and enters the gladiatorial games to rescue the son. With the help of a band of baboons, he succeeds.; Boy and Jad-bal-ja watch a young Waziri battle an ostrich in order to claim its plumes for his warrior's headdress. The warrior is attacked by more ostriches and Boy and Jad-bal-ja go to his rescue, each killing another ostrich. Boy claims the plumes.; Dan-El and scavenge food, clothing, and weapons from the wreck of the slavers' ship.