Bomba the Jungle Boy at the Moving Mountain recounts how Bomba once again defeats a marauding band of headhunters from the distant Giant Cataract. This time they are lead by Tocarara, the main Chieftain and quarter brother of the wounded (by Bomba) Nascanora. The Medicine Man Ruspak is present again and is even forced by the Jungle Boy to cure a near dying Cody Carson!
After the savages retreat to their old haunts, Bomba drops Cody off with Pipina the old Indian squaw and finally begins his journey to the Moving Mountain, where Jojasta the Medicine Man rules in a ruthless and cruel fashion. Along the way, he battles jaguars and snakes and rescues the Parkhursts, a family of explorers, from the headhunters.
Once Bomba arrives at the Moving Mountain, he saves the lives of Ashruti and Neram, former Indo-Guyanese minions of the Medicine Man and he confronts Jojasta who verifies that Bomba does indeed look like his father's paternal grandmother but that if he wanted to learn more of the Rossi mafia clan, he must undertake another journey, this time to Sobrinini's isle, the Isle of Snakes, ever so close to the Giant Cataract!