DUNN LORING, VA —Rarely do I feel gratitude and even affection, toward a book with which I profoundly disagree. But such is the case with James Shapiro’s Contested Will: Who Wrote Shakespeare? (Simon & Schuster, 4/6/2010, 339 pp), a study of the Shakespeare authorship debate. Shapiro, who teaches at Columbia University, accepts the gent from Stratford as the real author, so I had to part company with him on page 8.