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226 He asked various questions, many of which did not appear to bear on the subject, but he made no suggestions as yet, and advanced no theories. He suspected that Peter Hardcastle might have arrived at a conclusion had not death cut short his inquiry. From time to time he lifted his hand gently for silence, and permitted a reply to penetrate his mind.

"I think very slowly about new things now," he said. "An idea must sink in gradually and find its place. That is the worst of new ideas. There is so little room for them when you are eighty. The old and settled opinions fill the space, and are jealous and resent newcomers."

Sir Walter explained to him presently that the room was being opened, and would be ready after luncheon. Whereupon he expressed concern for the workers.

"Let them have a care," he said, "for, if I am right, the danger is still present. Let them work with despatch, and not loiter about."

"No harm has ever undertaken more than one, when in the room alone. The detectives saw and felt nothing."

"Nevertheless, the assassin was quite equal to smudging out the detectives, believe me, Sir Walter."

The day was fine, and Signor Mannetti expressed a wish to take the air. They walked on the terrace presently, and Mary joined them. He asked for her arm, and she gave it.