Abandoned by user

Miss Silver has appeared:

The lady who had got in was Miss Maud Silver. Her original occupation had been that of governess, and she still looked the part, but for a good many years now her neat professional card had carried in one corner the words Private Investigations. It was part of her business to be a good mixer. She owed no small measure of her success to the fact that people found her astonishingly easy to talk to. She neither repelled by stiffness nor alarmed by gush. If there is a middle way between these two extremes, it could be said that she pursued it equably. She now produced a mild but friendly response and remarked that it was always very annoying to miss a train—“but my watch is out of order, and I had to depend upon my niece’s dining-room clock, which is not, I am afraid, quite as reliable as she gave me to understand.”

I'm also pretty sure that we've got our first murder victim...