Brissard cabled to America, and received an answer from the American police to the effect that the address given was the office of a transfer company, and they were looking over the books to see what disposal had been made of the trunk. Brissard next began a search for the former Mlle. Morant in Brussels. As, however, there were some hundreds of jewellers in that city, this was no small undertaking. Successful detectives often admit that "luck" is a potent factor in their work, and the French detective now experienced a little good fortune. The various cities prominent as diamond markets are possessed of clubs at which congregate buyers and sellers of precious stones, and which also serve the purpose of a market where the members do business among themselves. With the assistance of a Belgian official, Brissard was introduced into such a club in Brussels, and here he learnt that a young Belgian--not a member, but a good judge of stones--had married a French girl named Martin. The fact was remembered because the young man had, shortly after his marriage, become possessed of several uncommonly valuable emeralds and diamonds. This man's address was given to M. Brissard, who at once called there--first, however, changing his appearance as a measure of precaution. The jeweller was not at home, he learnt; he was in Amsterdam, but was returning on the morrow. M. Brissard, posing as a brother jeweller, said he would call again. The lady of the house now came forward, and asked if there was anything she could do. One glance was enough for the detective--she was the daughter of the man Brissard was searching for! But he still was a long way from M. Morant himself, as after events proved. Calling the next day in company with a Belgian detective officer, M. Brissard was ushered in and presently the jeweller came into the room. The detective briefly made known his business, informing the jeweller that it rested with him whether he would be arrested or not, for it was known that some of the stolen jewels had been in his keeping. Thereupon the man told a most straightforward story to the following effect. He had been to London on business, and took his meals as usual in the locality frequented by his compatriots, dining at "Martin's." There he met his present wife, they fell in love with each other, and he was accepted as a prospective son-in-law. Being an authority on the value of precious stones, M. "Martin" confided to him that an aged sister had left him a few heirlooms, her husband having been a wealthy man. Would his future son-in-law appraise them? He had done so, greatly surprised at their value and size, and had further, shortly after his marriage, undertaken to sell several unset stones for his father-in-law. His wife was absolutely ignorant of all this, and not until that moment did he know that her real name was other than Martin.