Since the days of Cortés, rumors have circulated about a lost city of immense wealth hidden somewhere in the Honduran interior, called the White City or the Lost City of the Monkey God. In 1940, journalist Theodore Morde returned from the rainforest with hundreds of artifacts and an electrifying story of having found the Lost City -- but then committed suicide without revealing its location. In 2012, Preston joined a team of scientists using classified...