"In certain circles, her name inspires immediate recognition and pronouncements of a committed admiration that has likely spanned decades. As an author, Marguerite Henry was indeed remarkably prolific, with 59 books published, millions of copies sold, andnearly 80 years of her life spent writing them-or responding personally to the stacks of fan mail she received-at her typewriter. Her books, most meticulously researched historical fiction about influential...