Now, whatever Thorndyke might have observed on his own account, I had brought away from the dead man’s chambers only a single fact; and a very extraordinary fact it was. The cuneiform inscription was upside down. That was the sum of the evidence that I had collected; and the question was, What did it prove? To Thorndyke it conveyed some deep significance. What could that significance be?

The inverted position was not a mere temporary accident, as it might have been if the frame had been stood on a shelf or support. It was hung on the wall, and the plates screwed on the frame showed that its position was permanent and that it had never hung in any other. That it could have been hung up by Jeffrey himself was clearly inconceivable. But allowing that it had been fixed in its present position by some workman when the new tenant moved in, the fact remained that there it had hung, presumably for months, and that Jeffrey Blackmore, with his expert knowledge of the cuneiform character, had never noticed that it was upside down; or, if he had noticed it, that he had never taken the trouble to have it altered.