In 1925, Percy H. Fawcett was trudging through the Amazon, looking for what he was convinced was a lost civilization, which he called “Z,” when he vanished.  New Yorker writer David Grann stumbled on this anecdote while researching another story, and soon found himself so wrapped up in Fawcett’s Saga that he was on the verge of becoming one of the “Fawcett Freaks” who have also disappeared into the Amazon. Fortunately, he didn’t and instead he wrote his fantastic new book, The Lost City of Z: A Tale of Deadly Obsession in the Amazon, about which I interviewed him for World Hum.