The Great Detective summoned you out of the blue, as he is wont to do. There was no substance as to why your particular talents were required but, as always, you answered the call.
Arriving at the stoop of 221B Baker Street, you were not greeted as normal by the redoubtable Mrs. Hudson but by the slightly ajar door...you called out hesitantly, entered cautiously only to find the corpses of Sherlock Holmes and his companion Dr. Watson. Others of the Irregulars have arrived as well and the group of you are left with a horrific scene and the mystery of who killed the world's greatest detective.
An Irregular Affair is a mystery, an adventure and an entrée into a broader story that may take players far afield from their current lives in the Great City and roles as members of the Baker Street Irregulars. This game may become a continuing affair.