Bill went down on his knees, and applied his eye to the orifice. What he saw was confusing in the extreme. The scene of the drama that was being enacted inside was evidently just to the left, out of his line of vision. A subdued chink every now and then seemed to point to the fact that the invaders were still dealing with the figure in armour. There were two of these, Bill remembered. They stood together by the wall just under the Holbein portrait. The light of the electric torch was evidently being directed upon the operations in progress. It left the rest of the room nearly in darkness. Once a figure flitted across Bill’s line of vision, but there was not sufficient light to distinguish anything about it. It might have been that of a man or a woman. In a minute or two it flitted back again and then the subdued chinking sounded again. Presently there came a new sound, a faint tap-tap as of knuckles on wood.

Bill sat back on his heels suddenly.

“What is it?” whispered Virginia.