The Silent House by Fergus Hume

As may be surmised, Lucian was considerably startled by the discovery of this important evidence so confirmative of Diana's suspicions. Yet the knowledge which Link had gained relative to Mrs. Vrain's remaining at Berwin Manor to keep Christmas seemed to contradict the fact; and he could by no means reconcile her absence with the presence on the fence of the fragment of gauze; still less with the supposition that she must have climbed over a tolerably difficult obstacle to enter the yard, let alone the necessity -- by no means easy to a woman -- of descending into the disused cellar by means of a shaky and fragile ladder.

"After all," thought Lucian, when he was seated that same evening at his dinner, "I am no more certain that the veil is the property of Mrs. Vrain than I am that she was the woman whose shadow I saw on the blind. Whosoever it was that gained entrance by passing over fence and through cellar, must have come across the yard belonging to the house facing the other road. Therefore, the person must be known to the owner of that house, and I must discover who the owner is. Miss Greeb will know."