began to disappear for days into the Amazon, trekking through the jungle. He soon entered several grueling adventure contests: once, he hiked for seventy-two hours without sleep and traversed a canyon by shimmying across a rope. “The idea is to drain yourself physically and mentally and see how you respond under such circumstances,” Lynch said, adding, “Some people would break, but I always found it slightly exhilarating.”
Lynch was more than an adventurer. Drawn to quests that were intellectual as well as physical, he hoped to illuminate some little-known aspect of the world, and he often spent months in the library researching a topic. He had, for instance, ventured to the source of the Amazon and hadfound a colony of Mennonites living in the Bolivian desert. But he had never encountered a case like that of Colonel Fawcett.
Not only had previous search parties failed to discover the party’s fate—each disappearance becoming a conundrum unto itself—but no one had unraveled what Lynch considered the biggest enigma of all: Z. Indeed, Lynch found out that unlike other lost explorers—such as Amelia Earhart, who disappeared in 1937 while trying to fly around the globe—Fawcett had made it all but impossible to trace him. He had kept his route so secret that even his wife, Nina, confessed that he had concealed crucial details from her. Lynch dug up old newspaper accounts, but they provided few tangible clues. Then he found a dog-eared copy of
Exploration Fawcett,
a collection of some of the explorer’s writings edited by his surviving son, Brian, and published in 1953. (Ernest Hemingway had kept a copy of the book on his shelf.) The book appeared to contain one of the few hints of the colonel’s final course, quoting Fawcett as saying, “Our route will be from Dead Horse Camp, 11°43’ south and 54°35’ west, where my horse died in 1921.” Although the coordinates were only a starting point, Lynch plugged them into his Global Positioning System. It pinpointed a spot in the southern basin of the Amazon in Mato Grosso—its name means “thick forest”—a Brazilian state bigger than France and Great Britain combined. To reach Dead Horse Camp would require traversing some of the Amazon’s most intractable jungle; it would also entail entering lands controlled by indigenous tribes, which had secluded themselves in the dense forest and fiercely guarded their territory.
The challenge seemed insurmountable. But, as Lynch pored over financial spreadsheets at work, he wondered: What if there really is a Z? What if the jungle had concealed such a place? Even today, the Brazilian government estimates that there are more than sixty Indian tribes that have never been contacted by outsiders. “These forests are . . . almost the only place on earth where indigenous people can survive in isolation from the rest of mankind,” John Hemming, the distinguished historian of Brazilian Indians and a former director of the Royal Geographical Society, wrote.Sydney Possuelo, who was in charge of the Brazilian department set up to protect Indian tribes, has said of these groups, “No one knows for sure who they are, where they are, how many they are, and what languages they speak.” In 2006, members of a nomadic tribe called Nukak-Makú emerged from the Amazon in Colombia and announced that they were ready to join the modern world, though they were unaware that Colombia was a country and asked if the planes overhead were on an invisible road.
One night Lynch, unable to sleep, went into his study, which was cluttered with maps and relics from his previous expeditions. Amid his papers on Fawcett, he came across the colonel’s warning to his son: “If with all my experience we can’t make it, there’s not much hope for others.” Rather than deter Lynch, the words only compelled him. “I have to go,” he told his wife.
He soon secured a partner, Rene Delmotte, a Brazilian engineer whom he had met during an adventure