WATSON'S AMERICAN TALEWhen Sherlock Holmes, who was presumed dead at the hands of his arch nemesis, Professor Moriarty, returned in the story Dr.Watson chronicles as "The Adventure of the Empty House," we were told how the Great Detective had spent the intervening years abroad in disguise as a secret agent for England. For the devoted Holmes fan, that seemed sufficient to close this chapter of the duo's life and move on to new adventure.But when a...