Mademoiselle of Monte Carlo by William le Queux

For ten weary days Hugh Henfrey had lived in the close, frowsy-smelling house in Abingdon Road, Kensington, a small, old-fashioned place, once a residence of well-to-do persons, but now sadly out of repair.

Its occupier was a worthy, and somewhat wizened, widow named Mason, who was supposed to be the relict of an army surgeon who had been killed at the Battle of the Marne. She was about sixty, and suffered badly from asthma. Her house was too large for one maid, a stout, matronly person called Emily, hence the place was not kept as clean as it ought to have been, and the cuisine left much to be desired.