As a scientist, Sherlock Holmes would have certainly been familiar with the famous dictum attributed to Aristotle: Nature abhors a vacuum. In that same vein, fans of the Great Detective must look at 1885 and 1886 and see a somewhat similar void. Conan Doyle set no cases during those years; in fact, if you believe Doyle, Holmes and Watson remained inactive for a period of some 30 months. Given the expenses of everyday life, it's difficult to imagine...