From New Yorker staff writer and Harvard historian Jill Lepore, the dark, spellbinding tale of her restless search for the long-lost, longest book ever written, a century-old manuscript called "The Oral History of Our Time." Joe Gould, a madman, believed he was the most brilliant historian of the twentieth century. So did some of his friends, a group of modernist writers and artists that included E. E. Cummings, Marianne Moore, William Carlos Williams,...