Mrs Hudson's Case by Laurie R. King
Approx. 4,640 words.
Published on November 28, 2012.
When Sherlock Holmes retired to the Sussex Downs, his long-time (and long-suffering) housekeeper, Mrs Hudson, went along to run his life. But when the house is invaded, shortly after his meeting with Miss Mary Russell, Mr Holmes refuses to turn his mind to the problem, leaving Mrs Hudson herself to solve the case.