Ringo and Butch, young Americans who intend to explore a forest in Africa, rent a boat and venture out on a large river. Lost their way, after ending up in a rapid, they are captured by a tribe of indigenous people, who are then attacked by some adventurers in search of rubies. Ringo and Butch escape a net trap with help from Luana, a jungle girl in a primitive g-string bikini and primitive sandals who grew up in the jungle since she was a child. Ringo then finds an old, half-destroyed helicopter, which belonged to the Wilsons with Ringo identifying Luana as their missing daughter Susan Wilson. Ringo manages to repair it. Helped the natives to chase away the violent adventurers, they leave for the United States together with Susan, with whom Butch has fallen in love, with the rubies stolen from the criminals.
