Here let me say that I did not share the general confusion on this topic. I had my own theory, both as to the cause of this substitution and the moment when it was made. But the time had not yet come for me to advance it. I could only stand back and listen to the suppositions aired by the press, suppositions which fomented so much private discussion that ere long the one question most frequently heard in this connection was not who struck the blow which killed Mrs. Fairbrother (this was a question which some seemed to think settled), but whose juggling hand had palmed off the paste for the diamond, and how and when and where had the jugglery taken place? Opinions on this point were, as I have said, many and various. Some fixed upon the moment of exchange as that very critical and hardly appreciable one elapsing between the murder and Mr. Durand’s appearance upon the scene. This theory, I need not say, was advanced by such as believed that while he was not guilty of Mrs. Fairbrother’s murder, he had been guilty of taking advantage of the same to rob the body of what, in the terror and excitement of the moment, he evidently took to be her great gem. To others, among whom were many eyewitnesses of the event, it appeared to be a conceded fact that this substitution had been made prior to the ball and with Mrs. Fairbrother’s full cognizance. The effectual way in which she had wielded her fan between the glittering ornament on her breast and the inquisitive glances constantly leveled upon it might at the time have been due to coquetry, but to them it looked much more like an expression of fear lest the deception in which she was indulging should be discovered. No one fixed the time where I did; but then, no one but myself had watched the scene with the eyes of love; besides, and this must be remembered, most people, among whom I ventured to count the police officials, were mainly interested in proving Mr. Durand guilty, while I, with contrary mind, was bent on establishing such facts as confirmed the explanations he had been pleased to give us, explanations which necessitated a conviction, on Mrs. Fairbrother’s part, of the great value of the jewel she wore, and the consequent advisability of ridding herself of it temporarily, if, as so many believed, the full letter of the warning should read: “Be warned, he means to be at the ball. Expect trouble if you are found wearing the great diamond.”