“Then how did she get it?” I asked, much interested.

“I don’t say that she did get it,” cautioned Donnelly.  “I don’t know anything about it.  That is why I am here consulting Professor Kennedy.”

“Then who did get it, do you think?” I demanded.

“We have a great deal of very conflicting testimony from the various clerks,” Donnelly continued.  “Among those who are known to have visited the department and to have seen the necklace is another woman, of an entirely different character, well known in the city.”  He glanced sharply at us, as if to impress us with what he was about to say, then he leaned over and almost whispered the name.  “As nearly as I can gather out of the mass of evidence, Mrs. William Willoughby, the wife of the broker down in Wall Street, was the last person who was seen looking at the diamonds.”

The mere breath of such a suspicion would have been enough, without his stage-whisper method of imparting the information.  I felt that it was no wonder that, having even a suspicion of this sort, he should be in doubt how to go ahead and should wish Kennedy’s advice.  Ella Willoughby, besides being the wife of one of the best known operators in high-class stocks and bonds, was well known in the society columns of the newspapers.  She lived in Glenclair, where she was a leader of the smarter set at both the church and the country club.  The group who preserved this neat balance between higher things and the world, the flesh and the devil, I knew to be a very exclusive group, which, under the calm suburban surface, led a sufficiently rapid life.  Mrs. Willoughby, in addition to being a leader, was a very striking woman and a beautiful dresser, who set a fast pace for the semi-millionaires who composed the group.

Here indeed was a puzzle at the very start of the case.  It was in all probability Mrs. Willoughby who had looked at the jewels in both cases.  On the other hand, it was Annie Grayson who had been seen on at least one occasion, yet apparently had had nothing whatever to do with the missing jewels, at least not so far as any tangible evidence yet showed.  More than that, Donnelly vouchsafed the information that he had gone further and that some of the men work-ing under him had endeavoured to follow the movements of the two women and had found what looked to be a curious crossing of trails.  Both of them, he had found, had been in the habit of visiting, while shopping, the same little tea-room on Thirty-third Street, though no one had ever seen them together there, and the coincidence might be accounted for by the fact that many Glenclair ladies on shopping expeditions made this tea-room a sort of rendezvous.  By inquiring about among his own fraternity Donnelly had found that other stores also had reported losses recently, mostly of diamonds and pearls, both black and white.

Kennedy had been pondering the situation for some time, scarcely uttering a word.  Both detectives were now growing restless, waiting for him to say something.  As for me, I knew that if anything were said or done it would be in Kennedy’s own good time.  I had learned to have implicit faith and confidence in him, for I doubt if Craig could have been placed in a situation where he would not know just what to do after he had looked over the ground.