Alexis Paulvitch is not dead! He still despises Tarzan and has a score to settle with him. He lures Jack Tarzan's son away from London with Vengence in mind. But no son of Tarzan's is easily used. Jack escapes with the help of the ape named Akut and flees into the deep African jungle where his father Tarzan had been raised.

On his own Jack becomes known as Korak the Killer and builds a reputation for himself in the deepest jungle. As his father before him he finds his own place among the great apes.