David Grann is a staff writer for The New Yorker and the author of two nonfiction books that topped the best-seller list this summer: “The Wager” and “Killers of the Flower Moon,” from 2017, which Martin Scorsese has adapted into a film opening in October. Grann is among the most lauded nonfiction writers at The New Yorker; David Remnick says that “his urge to find unique stories and tell them with rigor and style is rare to the vanishing point.” Grann talks with Remnick about his beginnings as a writer, and about his almost obsessive research and writing process. “The trick is how can you tell a true story using these literary techniques and remain completely factually based,” Grann says. “What I realized as I did this more is that you are an excavator. You aren’t imagining the story—you are excavating the story.” Grann recounts travelling in rough seas to the desolate site of the eighteenth-century shipwreck at the heart of “The Wager,” his most recent book, so that he could convey the sailors’ despair more accurately. That book is also being made into a film by Scorcese. “It’s a learning curve because I’ve never been in the world of Hollywood,” Grann says. “You’re a historical resource. … Once they asked me, ‘What was the lighting in the room?’ I thought about it for a long time. That’s something I would not need to know, writing a book.” But Grann is glad to be in the hands of an expert, and keep his distance from the process. “I’m not actually interested in making a film,” he admits. “I’m really interested in these stories, and so I love that somebody else with their own vision and intellect is going to draw on these stories and add to our understanding of whatever this work is.”