An expedition to return a gorilla to Africa and find the Lost City of Zinj and its diamond mines encounters a variety of dangers.

It has been years since the man once known as Tarzan left the jungles of Africa behind for a gentrified life as John Clayton III, Lord Greystoke, with his beloved wife, Jane at his side. Now, he has been invited back to the Congo to serve as a trade emissary of Parliament, unaware that he is a pawn in a deadly convergence of greed and revenge, masterminded by the Belgian, Captain Leon Rom. But those behind the murderous plot have no idea what they...