Author of acclaimed biographies of Graham Greene and George Orwell, turns his attention to Mark Twain with an eagerly anticipated new book, Mark Twain: Man in White: The Grand Adventure of His Final Years.  It's a deeply researched book utilizing unpublished sources that bring to vivid life Twain's last years, a period that found the humorist full of charm, vigor and charisma. Critics call it "a breakthrough in Twain biography" and praise the scholarship and writing ("eloquent and moving").