"At least," said I as we heard her quick, firm steps descending the stairs, "she seems to be a young lady who is very well able to take care of herself."
     "And she would need to be," said Holmes gravely. "I am much mistaken if we do not hear from her before many days are past."
     It was not very long before my friend's prediction was fulfilled. A fortnight went by, during which I frequently found my thoughts turning in her direction and wondering what strange side-alley of human experience this lonely woman had strayed into. The unusual salary, the curious conditions, the light duties, all pointed to something abnormal, though whether a fad or a plot, or whether the man were a philanthropist or a villain, it was quite beyond my powers to determine. As to Holmes, I observed that he sat frequently for half an hour on end, with knitted brows and an abstracted air, but he swept the matter away with a wave of his hand when I mentioned it. "Data! data! data!" he cried impatiently. "I can't make bricks without clay." And yet he would always wind up by muttering that no sister of his should ever have accepted such a situation.
     The telegram which ............