Moriarty by John Gardner Harcourt, 2008, $24.00, 298 pages, ISBN 978-0-15-101252-7 A couple of weeks ago in MBR No. 33 we reviewed a retro Sherlock Holmes novel that generated some buzz.  It got us thinking; it might be fun to do another similar, but-not-quite-the-same kind of review.  So, this week’s Mysterious Book Report will cover a novel about Sherlock Holmes’ mortal enemy, a sinister, arch-criminal genius; the Napoleon of