To Sherlock Holmes, it was always the unmentionable. How many times did I heard him refer to the case of the Belgravian Banshee, onlny to instruct me to banish it from my memory and under no circumstances set it down as an adventure for public consumption. Holmes considered it his greatest failure, though I felt he was being rather too hard on himself. But Holmes was never a man who suffered personal failures lightly. Even when others of lesser ability would be celebrating the smashingly successful outcome to a baffling criminal case, Holmes was more apt to reprimand himself for