The 3 Caballeros are reunited and decide to go on an adventure in the Brazilian Mato Grosso (a plateau of swamps, grasslands and low mountains... NOT the Amazon area that is always seen in any Brazilian story) to seek diamonds.

They get involved in fighting an illegal trapper of wild animals who is also the dictatorial leader of a band of natives, and then accidentally stumble into a search for a legendary lost treasure city of Col. Percy Fawcett.

To read about this treasure, search the web for "Percy Fawcett" -- he was the true-life model for both Indiana Jones and Prof. Challenger (of Conan Doyle's "The Lost World"). As always, all my historical facts are based on true legends and actual events and real people.