An exiled chief returns to the jungle with three thieves and a plan to steal his former tribe's valuable ruby - using Tarzan as his unwitting accomplice.

After a guide for an archaeological expedition is killed, Tarzan decides to accompany the group in their quest to enter the forbidden "City Of Death", not only to protect them, but also to find out why a plant specialist and an ambitious colonel are also so interested in the place.

After uncovering the mythical Blue Stone of Baskar, Colonel Tatakombi takes advantage of the legend associated with it to declare himself the leader/god of the surrounding tribes, in the hope of later taking control of the country. Tarzan is determined to expose and stop him.

Tarzan encounters a female journalist who has arrived in the area for local tribal elections. The journalist has concerns over the conduct of a local white sponsor for one of the candidates.

Tarzan is checking on the Dwsari tribe when he discovers that somehow a white man, Arthur Brown, has become their king.

After poacher and arsonist Dan Burton escapes from custody, Tarzan tracks him and his adoring girlfriend to an oceanside cliff, and a fateful encounter. But Burton's girlfriend and two henchmen later track Tarzan down and force him to lead them back to the scene.