“His rooms were closed at six o’clock and have not since been occupied, so far as I can learn,” Gordon went on. “I have telephoned to him, telling him of the robbery, and he now is on his way here, that we may visit his rooms. It does not seem possible, however, that the robbery can have been committed from above.[Pg 6]

“Nor from below, Arthur, if all you have stated is correct,” Nick said, a bit dryly. “Is it possible to reach the back windows of this apartment from those of the Carroll Building?”

“No, no; it is quite impossible,” Gordon protested. “The distance is more than twenty feet. Besides, Nick, there is no evidence that the windows of this flat have been opened. All of them were securely locked and——”

“I will inspect them presently,” Nick interrupted. “It is very evident, at least, that robbers have been here, and I know their knavery was not accomplished by any supernatural means. Who knew of Mr. Strickland’s intention to dine with you and be absent from his apartments this evening?”

“Nobody knew it, Mr. Carter,” Miss Strickland cried, with girlish earnestness. “We did not know it ourselves until after we came here. We then persuaded Uncle Rudolph to go with us.”

“Were any other persons present?”

“No, sir, only we three. No one could have overheard us.”

“Mina is right,” put in Gordon. “No person could have known that Mr. Strickland would be absent this evening. It was entirely unpremeditated. The crime could not have been planned from any knowledge of our intention.”

“Do you keep any servants, Mr. Strickland?” Nick inquired, turning to him.

He had overcome his agitation, his terrible distress immediately following his discovery of the crime, made hardly an hour before. He appeared to derive much hope and encouragement from what Nick had said to him, and from the fact that an investigation by the famous detective already was in progress.