"Yes--the grille bars are of tempered steel and the openings between them are too small to permit anyone to put his hand through. Therefore, as we are somewhat pressed for space, we stack them up right along the outer wall of the grille and then work back. It saves time and labor in bringing them in." "Is this the way the door of the grille ordinarily hangs?" Bosbyshell inspected it a moment before he replied. "Yes," he said. "It appears to be all right. It was purposely made to swing clear of the floor and the ceiling so that it might not become jammed. The combination and the use of the seal prevents its being opened by anyone who has no business in the grille." "And the seal was intact when you came in yesterday afternoon?" "It was." "Thanks," said Drummond; "that was all I wanted to know," and he made his way upstairs with a smile which seemed to say that his vacation in the Maine woods had not been indefinitely postponed. Once back in the director's office, the government operative asked permission to use the telephone, and, calling the Philadelphia office of the Secret Service, requested that three agents be assigned to meet him down town as soon as possible. "Have you a record of the home address of the people employed in the Mint?" Drummond inquired of the director, as he hung up the receiver. "Surely," said Preston, producing a typewritten list from the drawer of his desk. "I'll borrow this for a while, if I may. I'll probably be back with it before three o'clock--and bring some news with me, too," and the operative was out of the room before Preston could frame a single question. As a matter of fact, the clock in the director's office pointed to two-thirty when Drummond returned, accompanied by the three men who had been assigned to assist him. "Have you discovered anything?" Preston demanded. "Let's have Cochrane up here first," Drummond smiled. "I can't be positive until I've talked to him. You might have the superintendent in, too. He'll be interested in developments, I think." Bosbyshell was the first to arrive, and, at Drummond's request, took up a position on the far side of the room. As soon as he had entered, two of the other Secret Service men ranged themselves on the other side of the doorway and, the moment Cochrane came in, closed the door behind him. "Cochrane," said Drummond, "what did you do with the seven hundred pounds of gold that you took from Vault No. Six during the past few weeks?" "What--what--" stammered the weigher.