each one of these vaults to take any chance with, which is the reason for this double protection. Two men--Cochrane and I--handle the combination to the vault door and open it whenever necessary. Two others--Jamison and Strubel--are the only ones that know how to open the grille door. One of them has to be present whenever the bars are put in or taken away, for the men who can get inside the vault cannot enter the grille, and the men who can manipulate the grille door can't get into the vault.""It certainly sounds like a burglar-proof combination," commented Drummond. "Is there any possibility for[19] conspiracy be-
tween"--and he hesitated for the fraction of a second--"between Cochrane and either of the men who can open the grille door?"
"Apparently not the least in the world," replied Preston. "So far as we know they are all as honest as the day--" "But the fact remains," Drummond interrupted, "that the gold is missing."
"Exactly--but the grille door was sealed with the official governmental stamp when we entered the vault yesterday. That stamp is applied only in the presence of both men who know the combination. So the conspiracy, if there be any, must have included Cochrane, Strubel, and Jamison--instead of being a two-man job."
"How much gold did you say was missing?" inquired the Treasury operative, taking another tack.
"Seven hundred pounds--fifty bars of fourteen pounds each," answered Bosbyshell. "That's another problem that defies explanation. How could one man carry away all that gold without being seen? He'd need a dray to cart it off, and we're very careful about what goes out of the Mint. There's a guard at the front door all the time, and no one is allowed to leave with a package of any kind until it has been examined and passed."
A grunt was Drummond's only comment--and those who knew the Secret Service man best would have interpreted the sound to
mean studious digestion of facts, rather than admission of even temporary defeat.
It was one of the government detective's pet theories that every crime, no matter how puzzling, could be solved by application of common-sense principles and the rules of logic. "The criminal with brains," he was fond of saying, "will deliberately try to throw you off the scent. Then you've got to take your time and separate the wheat[20] from the chaff--the false leads from the true. But the man who commits a crime on the spur of the moment--or who flatters himself that he hasn't left a single clue behind--is the one who's easy to catch. The cleverest crook in the world can't enter a room without leaving his visiting card in some way or other. It's up to you to find that card and read the name on it. And common sense is the best reading glass."
8
Requesting that his mission be kept secret, Drummond said that he would like to examine Vault No. Six. "Let Cochrane open the vault for me and then have Jamison and Strubel open the grille," he directed.
"Unless Mr. Bosbyshell opened the vault door," Preston reminded him, "there's no one but Cochrane who could do it. It won't be necessary, however, to have either of the others open the grille--the door was taken from its hinges this morning in order the better to examine the place and it hasn't yet been replaced."
"All right," agreed Drummond. "Let's have Cochrane work the outer combination, then. I'll have a look at the other two later." Accompanied by the director and the superintendent, Drummond made his way to the basement where they were joined by the
official weigher, a man well over fifty, who was introduced by Preston to "Mr. Drummond, a visitor who is desirous of seeing the
vaults."
"I understand that you are the only man who can open them," said the detective. "Suppose we look into this one," as he stopped, as if by accident, before Vault No. 6.
Cochrane, without a word, bent forward and commenced to twirl the combination. A few spins to the right, a few to the left, back to the right, to the left once more--and he pulled at the heavy door expectantly. But it failed to budge.[21]
Again he bent over the combination, spinning it rapidly. Still the door refused to open.
"I'm afraid I'll have to ask you to help me with this, Superintendent," Cochrane said, finally. "It doesn't seem to work, somehow." But, under Bosbyshell's manipulation, the door swung back almost instantly.
"Nothing wrong with the combination," commented Preston.
Drummond smiled. "Has the combination been changed recently?" he asked.
"Not for the past month," Bosbyshell replied. "We usually switch all of them six times a year, just as a general precaution--but this has been the same for the past few weeks. Ever since the fifteenth of last month, to be precise."
Inside the vault Drummond found that, as Preston had stated, the door to the grille had been taken from its hinges, to facilitate the work of the men who had weighed the gold, and had not been replaced.
"Where are the gold bars?" asked the detective. "The place looks like it had been well looted." "They were all taken out this morning, to be carefully weighed," was Preston's reply.
"I'd like to see some of them stacked up there along the side of the grille, if it isn't too much trouble." "Surely," said Bosbyshell. "I'll have the men bring them in at once."
As soon as the superintendent had left the room, Drummond requested that the door of the grille be placed in its usual position, and Cochrane set it up level with the floor, leaning against the supports at the side.
"Is that the way it always stays?" inquired the Secret Service man.[22]
"No, sir, but it's pretty heavy to handle, and I thought you just wanted to get a general idea of things."
"I'd like to see it in place, if you don't mind. Here, I'll help you with it--but we better slip our coats off, for it looks like a man's-sized job," and he removed his coat as he spoke.
After Cochrane had followed his example, the two of them hung the heavy door from its hinges and stepped back to get the effect. But Drummond's eyes were fixed, not upon the entrance to the grille, but on the middle of Cochrane's back, and, when the opportunity offered an instant later, he shifted his gaze to the waist of the elder man's trousers. Something that he saw there caused the
9
shadow of a smile to flit across his face.
"Thanks," he said. "That will do nicely," and he made a quick gesture to Preston that he would like to have Cochrane leave the vault. "Very much obliged, Mr. Cochrane," said the director. "We won't bother you any more. You might ask those men to hurry in with
the bars, if you will."
And the weigher, pausing only to secure his coat, left the vault.
"Why all the stage setting?" inquired Preston. "You don't suspect...."
"I don't suspect a thing," Drummond smiled, searching for his own coat, "beyond the fact that the solution to the mystery is so sim-
ple as to be almost absurd. By the way, have you noticed those scratches on the bars of the grille, about four feet from the floor?"
"No, I hadn't," admitted the director. "But what of them? These vaults aren't new, you know, and I dare say you'd find similar marks
on the grille bars in any of the others."
"I hope not," Drummond replied, grimly, "for that[23] would almost certainly mean a shortage of gold in
