It is a capital mistake to theorize before one has data. Women are naturally secretive, and they like to do their own secreting. As a rule, the more bizarre a thing is the less mysterious it proves to be. It is my business to know things. It has long been an axiom of mine that the little things are infinitely the most important.
Singularity is almost invariably a clue.
Circumstantial evidence is a very tricky thing. You know my method. It is founded upon the observation of trifles. It is, of course, a trifle, but there is nothing so important as trifles. My name is Sherlock Holmes.