"A brother and a sister will be charmed to follow a magic ball that will lead them to a trap. With the advice and help of an owl, a condor and an old man, the brother will find a way to help his sister. In the afterword we talk more about the Andean Mountains. We finish the program with a riddle."
Other source: book Latin American Tales, From the Pampas to the pyramids of Mexico, stories collected by Genevieve Barlow. Rand Mc Nally & Company. 1966