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.
"Make me tidy as quickly as you can," he said to Belton when the latter appeared, "and while you are doing so listen to my final instructions."
"To-night, as you know, I am endeavoring to secure the Duchess of Wiltshire's necklace. To-morrow all London will resound with the hubbub, and I have been making my plans in such a way as to arrange that Klimo shall be the first person consulted. When the messenger calls, if call he does, see that the old woman next door bids him tell the Duke to come personally at twelve o'clock. Do you understand?"
"Perfectly, sir."
"Very good. Now give me the jewel case, and let me be off. You need not sit up for me."
Precisely as the clocks in the neighborhood were striking ten Simon Carne reached Belgrave Square, and, as he hoped, found himself the first guest.