January is revered by Sherlock Holmes geeks each year because the biggest Sherlock Holmes geek ever—the late William S. Baring-Gould—decreed that Sherlock’s presumed birthday is January 6th. The best-known mystery magazine, Ellery Queen’s Mystery Magazine, actually pubs a Sherlock Holmes issue each year at this time. And at the top of the year, I too try to do some sort of Sherlockian post at SleuthSayers, the mystery writers blog that I write for…