Ever since the conquest of the Inca empire, tales of hidden Inca gold have tempted all manner of treasure seekers to risk their lives in Ecuador's forbidding Llanganati mountains. Most people think it's just a fool's errand, even though scholarship points to the fact that there really is likely a gold hoard stashed somewhere.
Mark Honigsbaum is not a treasure hunter - in fact, he is a scholar/journalist who previously wrote a history of malaria. Or rather, he wasn't a treasure hunter until he happened upon documents long forgotten in the UK Royal Botanic Gardens archive. The guide and map he uncovered seemed to fill an important gap in existing clues about gold hidden after the murder of the Inca king Atahualpa.
Honigsbaum was hooked, and the game afoot, complete with a Swiss German gun runner, a former Ecuadorian track star, the requisite native guide who seems to know more than he lets on, and lots of miserable trekking through shrouded icy windswept bogs.
The productions were similar because each one uses multiple readers to portray the various characters narrating the story. The stories are similar because they are both set in the South and each portrays a time when racism was much more openly accepted than it is today.