Arthur Conan Doyle,
The Great Shadow — Chapter 8
(1892)
“ On the right of this gate, on the garden side, was a bit of a rockery which was said to have been made by my father's mother many years before. She had fashioned it out of water-worn stones and sea shells, with mosses and ferns in the chinks. Well, as we came in through the gates my eyes fell upon this stone heap, and there was a letter stuck in a cleft stick upon the top of it. I took a step forward to see what it was, but Edie sprang in front of me, and plucking it off she thrust it into her pocket. ”
