Arriving at the house he discovered some workmen erecting an awning across the footway in preparation for the ball that was to take place at night. It was not long, however, before he found himself in the boudoir, reminding Her Grace of her promise to permit him an opportunity of making a drawing of the famous jewel case. The Duchess was naturally busy, and within a quarter of an hour he was on his way home with the box placed on the seat of the carriage beside him. "Now," he said as he patted it good-humoredly, "if only the notion worked out by Hiram Singh and Wajib Baksh holds good, the famous Wiltshire diamonds will become my property before very many hours are passed. By this time to-morrow, I suppose, London will be all agog concerning the burglary." On reaching his house he left his carriage, and himself carried the box into his study. Once there he rang his bell and ordered Hiram Singh and Wajib Baksh to be sent to him. When they arrived he showed them the box upon which they were to exercise their ingenuity. "Bring your tools in here," he said, "and do the work under my own eyes. You have but nine hours before you, so you must make the most of them." The men went for their implements, and as soon as they were ready set to work. All through the day they were kept hard at it, with the result that by five o’clock the alterations had been effected and the case stood ready. By the time Carne returned from his afternoon drive in the Park it was quite prepared for the part it was to play in his scheme. Having praised the men, he turned them out and locked the door, then went across the room and unlocked a drawer in his writing-table. From it he took a flat leather jewel case, which he opened. It contained a necklace of counterfeit diamonds, if anything a little larger than the one he intended to try to obtain. He had purchased it that morning in the Burlington Arcade for the purpose of testing the apparatus his servants had made, and this he now proceeded to do. Laying it carefully upon the bottom he closed the lid and turned the key. When he opened it again the necklace was gone, and even though he knew the secret he could not for the life of him see where the false bottom began and ended. After that he reset the trap and tossed the necklace carelessly in. To his delight it acted as well as on the previous occasion. He could scarcely contain his satisfaction. His conscience, was sufficiently elastic to give him no trouble. To him it was scarcely a robbery he was planning, but an artistic trial of skill, in which he pitted his wits and cunning against the forces of society in general. At half-past seven he dined, and afterwards smoked a meditative cigar over the evening paper in the billiard-room. The invitations to the ball were for ten o’clock, and at nine-thirty he went to his dressing-room.