“When was that?” asked Battle quickly.

“Just before lunch. It seems he’d heard of the one in here. I showed him that, and then took him up to the White Gallery, and we finished up with the Priest’s Hole. But his enthusiasm was waning by that time. He looked bored to death. But I made him go through with it.” Lord Caterham chuckled at the remembrance.

Anthony put a hand on Lemoine’s arm.

“Come outside,” he said softly. “I want to speak to you.”

The two men went out together through the window. When they had gone a sufficient distance from the house, Anthony drew from his pocket the scrap of paper that Boris had given him that morning.

“Look here,” he said. “Did you drop this?”

Lemoine took it and examined it with some interest.

“No,” he said. “I have never seen it before. Why?”