French military man Adrien Dufourquet gets an eight-day furlough to visit his fiancée, Agnès. But when he arrives in Paris, he learns that her late father's partner, museum curator Professor Catalan, has just been kidnapped by a group of Amazon tribesmen who have also stolen a priceless statue from the museum. Adrien and Agnès pursue the kidnappers to Brazil, where they learn that the statue is the key to a hidden Amazon treasure.
Stan and Ollie are marooned on an island in the south pacific island.
Professor Calculus's friend develops a blue-skinned orange that can grow on any kind of land and survive harsh weather (in the manner of Lue Gim Gong) and therefore solve world hunger. The Professor and his friends, however, run afoul of gangsters who also covet the fruit. The adventure takes them from their home in Marlinspike Hall (Moulinsart), a fictional mansion that is presumably in Belgium, to Spain, where Calculus and another scientist are kidnapped.
