He strolled across the park in an unusually thoughtful mood. He purposely chose to approach the house from the same direction as that from which he had come on the fateful Thursday night, and as he drew near to it he looked up at the windows cudgelling his brains to make sure of the one where he had seen the light. Was he quite sure that it was the second from the end?

And, doing so, he made a discovery. There was an angle at the corner of the house in which was a window set farther back. Standing on one spot, you counted this window as the first, and the first one built out over the Council Chamber as the second, but move a few yards to the right and the part built out over the Council Chamber appeared to be the end of the house. The first window was invisible, and the two windows of the rooms over the Council Chamber would have appeared the first and second from the end. Where exactly had he been standing when he had seen the light flash up?