David Grann has been a staff writer at The New Yorker since 2003. He is the author of "The Lost City of Z: A Tale of Deadly Obsession in the Amazon," and his stories have appeared in several anthologies, including "What We Saw: The Events of September 11, 2001"; "The Best American Crime Writing," of 2004, 2005, and 2009; and "The Best American ...