He told his story to the millionaire glibly, and had hardly finished it when some one in the adjoining room whistled the tune of a popular air. Whereupon Mr. Sanborn very sharply said that the bureau’s services were not required, and he imagined that none of his guests were going to rob him on such an occasion. The man calling tried to persuade Mr. Sanborn that he was running a great danger, but Mr. Sanborn would have nothing of it, and cut the interview short rather arrogantly: There was nothing for the man to do but to leave, and so he went out of the house. Nick returned to the room, saying: “I supposed,” he said, “that I would recognize any one the Detective Bureau might be likely to send to you. But what I did recognize at a glance was that this man, who has just left us, is one of the most dexterous crooks, who works in large cities. He is a Philadelphia man, and I am sure he is the one who conducted those robberies at the great receptions last winter in Washington.” “Then,” said Mr. Sanborn, “you believe your note of this morning was a good warning?” “I must,” replied Nick, “under the circumstances, and I will be prepared to meet any effort made to-day.” Mr. Sanborn, after producing a box of cigars, said to Nick: “I must go and prepare for this affair. I shall leave you here to do as you see fit. If you desire to see me at any time, call a servant and send for me.” He went out of the room. Nick took up a book and sat himself down to await the arrival of his assistants. The first to arrive was Patsy, who, on appearing at the door, was at once taken to the room where Nick was waiting. As he entered, Nick looked up in genuine surprise. Patsy had made the effort of his life, and would have been taken, in the care and correctness of his dress, for one of the fashionable swells of the city. “You do me proud,” said Nick. “I was going to do something of that myself, but, after looking at you, I’m afraid I’ll never be able to get to that perfection.” “Oh,” replied Patsy, a little embarrassed under his chief’s teasing, “I guess I know how to get myself up to do credit to my chief. I’m only obeying orders, though.” “As you always do, Patsy,” replied Nick. “You’ve obeyed orders to the very letter.” Nick now got up, and, taking his hat, said: “I’m going away to try to rival your elegance. Now, Patsy, I leave you in charge, and you must keep a good watch over the house. Already an effort has been made by Lannigan----” “What, is that man at work again?” cried Patsy. “I thought you had frightened him off.” “I thought so, too, but you know a leopard can’t change his spots. Lannigan is supposed to have made an attempt to get into the house, but failed, and escaped before he could be captured again. I fancy he is again employed by somebody who knows his ability as a cracksman; so if you spot Lannigan, keep close to him and see where the trail leads.”