“Thank God!” he cried. “Then what in the world did the thief want?”

“Probably he meant to take the stones, but was interrupted.”

“In that case one would expect him to take them out one at a time, but the setting of each of these has been loosened, and yet the stones are all here.”

“It is certainly most extraordinary,” said the inspector. “I never remember a case like it. Let us see the watchman.”

The commissionaire was called—a soldierly, honest-faced man, who seemed as concerned as Ward Mortimer at the incident.

“No, sir, I never heard a sound,” he answered, in reply to the questions of the inspector. “I made my rounds four times, as usual, but I saw nothing suspicious. I’ve been in my position ten years, but nothing of the kind has ever occurred before.”

“No thief could have come through the windows?”

“Impossible, sir.”

“Or passed you at the door?”

“No, sir; I never left my post except when I walked my rounds.”