"We want to speak to your grandfather," Brodie announced. "You needn't leave the shop. I know the way."
They passed down the little steps into the stuffy parlour. Abraham Letchowiski was sitting in his chair, gazing into the fire and mumbling to himself. He looked at the visitors uneasily.
"What do you want here?" he asked. "I am not well to-day. I am not speaking of business."
"That's all right, Mr. Letchowiski," Brodie answered. "It's just a word with your assistant we're after."
The uneasiness in the old man's face changed into terror.
"What do you want with him?" he exclaimed. "He is a respectable young man, a very clever watchmaker. He comes from Switzerland. He has done nothing wrong."
Brodie turned to the constable.
"Don't let him move," he directed. "I hear the dynamo stopping."
He ran down the passage and threw open door. The man who had been working at bench turned to face him. The whir of the dynamo was slackening, but Harvey Grimm had had no time to collect his tools. There were several curiously shaped knives and fine files and chisels lying about. Brodie saw them, and his eyes sparkled.
"Edward Levy," he said, "I arrest you on the charge of breaking up stolen diamonds. I have a constable in the room outside. You'll have to come up to the police-station with us and be questioned."