I advanced to the window, in which was set the large dressing-table with its big swing-mirror and silver-topped bottles, and on gazing out saw, to my surprise, it was the only window which gave a view of that corner of Rannoch Wood where the double tragedy had taken place.

Indeed, any person standing at the spot would have a clear view of that one distant window while out of sight of all the rest.

A light might be placed there at night as signal, for instance; or by day a towel might be hung from the window as though to dry and yet could be plainly seen at that distance.
Another object in the room also attracted my attention--a pair of long field-glasses.

Had she used these to keep watch upon that spot?
I took them up and focused them upon the boundary of the wood, finding that I could distinguish everything quite plainly.
"That's where they found the man who was murdered," explained the servant, who still stood in the doorway.
"I know," I replied.

"I was just trying the glasses." Then I put them down, and on turning saw upon the mantelshelf a small, bright-red candleshade, which I took in my hand.