Suddenly there was a low rustle, and Lady Yardly appeared framed in the doorway, a radiant figure in a long white shimmering dress. Round the column of her neck was a rivulet of fire. She stood there with one hand just touching the necklace.

“Behold the sacrifice,” she said gaily. Her ill-humour seemed to have vanished. “Wait while I turn the big light on and you shall feast your eyes on the ugliest necklace in England.”

The switches were just outside the door. As she stretched out her hand to them, the incredible thing happened. Suddenly without any warning, every light was extinguished, the door banged, and from the other side of it came a long-drawn piercing woman’s scream.

“My God!” cried Lord Yardly. “That was Maude’s voice! What has happened?”