"Well, with your permission, I propose to strike while the iron is hot," Jack said. "It is quite evident that this rubbish has been purchased very recently from Osmond's. If you will allow me to do so, I will go at once with the cases to Clerkenwell, and ascertain the purchaser. If we can bring Carrington to book promptly, we may recover Lady Barmouth's jewels yet."

Barmouth had nothing to say except in praise of this suggestion. Accordingly, Jack set off in a cab for Clerkenwell, where he had no difficulty in finding the fine business premises of Osmond & Co. He lost no time in diplomacy, but proceeded to lay the whole matter before the head of the firm.

"You will see there is something very wrong here," he said. "This manufacture of yours has been deliberately substituted for some valuable gems belonging to a lady whose name I am not at liberty to divulge for the present. Mr. Flint, of Bond Street, says that the paste has been purchased from you. We have absolute proof of the fact that the stuff was bought during the past two hours. I shall be glad if you will tell me the name of the purchaser. I don't suppose the stuff was booked.

"Mr. Osmond explained that theirs was practically a cash business. A few inquiries elicited the fact that the paste had been bought about two hours before by a tall, slim gentleman, who had driven up in a hansom cab. There was another gentleman in the cab, but he had not entered the shop.

"Were the jewels paid for in cash?" Jack asked.

They had not been paid for in hard cash, the cashier explained. The bill had come to two hundred pounds altogether, and had been made out to a Mr. Morrison. He had paid for them with twenty ten-pound notes in a most businesslike way, and gone away again--the whole thing not having taken more than five minutes. Jack suggested that he would like to see the notes. They were fresh and clean, but across the face of all of them was a circular blue mark bearing the words, "City and provincial Bank!"

[CHAPTER XXXIV.]

IN THE VAULT.

Here was proof positive enough to convict Carrington of the crime which had been alleged against him. Nor did Jack doubt for a moment that Anstruther was at the bottom of this daring and original scheme. The mere fact that there was another man in the cab with Carrington was sufficient to prove this point, for nobody else was likely to accompany the bank manager on so delicate and private an errand. Where the fatal mistake came in, was in Carrington taking the Bank of England notes from his own safe, and ignoring the fact that the official blue stamp was upon them.

As Jack stepped into the street, he had pretty well made up his mind what to do. Not for a moment did he believe that Carrington had an accomplice amongst his own staff. Jack reached the premises of the City and provincial at length, and asked to see Mr. Carrington. He was told that that gentleman had suddenly been called out on important business, and was not expected back to-day. But Masefield was not in the least disappointed to hear this. There was nothing for it now, but to return to Belgrave Square, and tell the Barmouths what had happened. He found Lord Barmouth in the drawing-room, where the blinds had been pulled down. Lady Barmouth had gone to an important function which she could not very well ignore, and had taken Claire along with her. Lord Barmouth listened gravely to all that Jack had to say.