Andy Barnes gets word by short wave that two of the three geologists who passed through his district some weeks before were known diamond smugglers, and that nothing since has been heard of the trio. And he also learns that a hunter, Pat Gilroy , who has just arrived at the compound is really an escaped convict named Roy DeHaven. Bomba the Jungle Boy He is summoned via the jungle drum wireless-telegraph, and Barnes asks Bomba to locate Gatesby, the geologist who was with Greg and Hardy. Bomba finds the body of Gatesby but he also finds Lita Sebastian who is also out in the jungle looking for her father. Through the help of jungle drums and his animal friends, Bomba leads Lita to where her father, and a large number of natives, are being held as slaves by Greg and Hardy, who have found diamonds in the crater of an extinct volcano, known locally as The Mountain of Diamonds. Bomba has a lot of work to do before he can restore order to this jungle.