There are stories, and then there are the stories behind them. A tale well-told lingers long after the last word is read, but a tale wrapped in uncertainty and deception—now, that is a story that lives on. Washington Irving knew this well. He did not simply write “Rip Van Winkle” and “The Legend of Sleepy Hollow”; he conjured them into existence, cloaking them in the guise of lost manuscripts and half-remembered folklore, so that even now, centuries later, we wonder: where does the truth end, and where does the legend begin? I first encountered these stories in my youth, though,…