Have you taken anything off this shelf, Hopkins?"

Have you taken anything off this shelf, Hopkins?"

"No, I have moved nothing."

"Something has been taken. There is less dust in this corner of the shelf than elsewhere. It may have been a book lying on its side. It may have been a box. Well, well, I can do nothing more. Let us walk in these beautiful woods, Watson, and give a few hours to the birds and the flowers. We shall meet you here later, Hopkins, and see if we can come to closer quarters with the gentleman who has paid this visit in the night."
chauffeur sydney
Pashmina scarf

what? i don't get it...