The Lady of the Basement Flat — George De Horne Vaizey

What would you do if the sister with whom you had spent your whole life was suddenly whisked away by a suitor? That's exactly the fate that befalls a certain Miss Harding, the eccentric heroine at the center of The Lady of the Basement Flat. Dedicating herself to charitable acts carried out under the cloak of anonymity, Miss Harding is able to find some measure of happiness -- when suddenly, love turns her whole world upside down.