Mrs Hudson's Case

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.
Note: Mrs Hudson's Case is now also included in King's 2016 short story collection, Mary Russell's War: And Other Stories of Suspense.