There are around 200 active Sherlockian groups in North America. This month alone there have been meetings of the Stormy Petrels of Vancouver, the Hansom Wheels of Columbia, Dr Watson’s Neglected Patients in Denver, the Notorious Canary-Trainers of Madison, the Sound of the Baskervilles in Seattle and the Bootmakers of Toronto. The Norwegian Explorers of Minnesota, founded in 1948, are holding their annual dinner, while the Afghanistan Perceivers of Oklahoma and the Illustrious Clients of Indianapolis are both staging Blue Carbuncle celebrations.