A short walk through Boundary Road and St. John's Wood Park brought us into Avenue Road, where, half-way down on the left, Wills halted, saying:
"Here we are. This is the house—the house of the mystery! I wonder what we shall find!"
"The place has been to let furnished for nearly a year, sir," Saunders remarked. "See! the board is still up. I was on this beat three months ago and, funnily enough, one night, though the place was closed, I could have sworn that I saw a light in one of those upper windows. But afterwards I decided that it was only a reflection upon the glass."
The house, a large old-fashioned detached one, stood back behind a high wall. Above its iron gate was displayed a weather-worn board, announcing that the place was to let furnished, while, seen from the road, the premises bore a faded, neglected air. The garden-paths were weedy, the beds entangled and over-grown, while the yellow blinds, all of which were drawn, were limp, dirty and discoloured.
Smartly painted well-kept houses were on either side, their gardens bright with geraniums,
