Bill peered at her suspiciously through the darkness. He heard a faint sound which might have been either a sob or a laugh. Then he grasped the poker firmly and rose to his feet. He felt that he was fully alive to the situation.

Very softly he turned the handle of the door. It yielded and swung gently inwards. Bill felt Virginia close beside him. Together they moved noiselessly into the room.

At the farther end of the room, the torch was playing upon the Holbein picture. Silhouetted against it was the figure of a man, standing on a chair and gently tapping on the panelling! His back, of course, was to them, and he merely loomed up as a monstrous shadow.

What more they might have seen cannot be told, for at that moment Bill’s nails squeaked upon the parquet floor. The man swung round, directing the powerful torch full upon them and almost dazzling them with the sudden glare.

Bill did not hesitate.