A scientific expedition happens to discover that gold exists on Tarzan's escarpment. The villainous Medford and Vandermeer kidnap Jane and Boy to extort from Tarzan the location of the gold.

Circus owner Buck Rand kidnaps Boy to perform in his show. He forces a pilot to fly him, Boy and his animal trainer out of the jungle. Tarzan and Jane follow them to New York.

A young couple die in a plane crash in the jungle. Their son is found by Tarzan and Jane who name him Boy and raise him as their own. Five years later a search party comes to find the young heir to millions of dollars. Jane agrees, against Tarzan's will, to lead them to civilization.

White hunter Captain Fry tries to take Tarzan back to civilization, caged for public display. He arrives in the jungle with Jane's cousins, Eric and Rita, who want Jane's help in claiming a fortune left her.

Bank clerk William Marble is desperate for money to pay his family's bills. When his wealthy nephew visits, Marble asks him for a loan, but the young man refuses. Marble decides to kill his nephew. It is a twisted path to justice after Marble is transformed by the crime he committed and the wealth he gains.