Lord Sotherst took these things in charge, and John Dory turned to the man whom they had found standing over him.

“Tell us exactly what happened,” he said, briefly.

“I was standing outside the door,” the man answered. “I heard no sound inside—there was nothing to excite suspicion in any way. Suddenly there was this explosion. It took me, perhaps, thirty or forty seconds to get the key out of my pocket and unlock the door. When I entered, the side of the room was blown in like that, the diamonds were gone, Saunders was leaning forward just in the position he is in now, and there wasn’t another soul in sight. Then you and the others came.”

John Dory rushed from the room; they had brought him word that the car was waiting. At such a moment, he was ready even to forget his ancient enmity. He turned towards Peter Ruff, whose calm bearing somehow or other impressed even the detective with a sense of power.

“Will you come along?” he asked.

Peter Ruff shook his head.

“Thank you, Dory, no!” he said. “I am glad you have asked me, but I think you had better go alone.”

A few seconds later, the pursuit was started. Saunders was carried out of the room, followed by the doctor. There remained only Peter Ruff and the man who had been on duty outside. Peter Ruff seated himself where Saunders had been sitting, and seemed to be closely examining the table all round for some moments. Once he took up something from between the pages of the book which the Sergeant had apparently been reading, and put it carefully into his own pocketbook. Then he leaned back in the chair, with his hands clasped behind his head and his eyes fixed upon the ceiling, as though thinking intently.

“Hastings,” he said to the policeman, who all the time was pursuing a stream of garrulous, inconsequent remarks, “I wonder whether you’d step outside and see Mr. Richards, the butler. Ask him if he would be so good as to spare me a moment.”

“I’ll do it, sir,” the man answered, with one more glance through the open space. “Lord!” he added, “they must have been in through there and out again like cats!”