Venner sat just for a moment or two with the thin stream trickling through his fingers, and wondering what it all meant. With his superior knowledge of past events, he could see in this something that it was impossible for Gurdon to follow. "I suppose this is some of the gold from the Four Finger Mine?" Gurdon suggested. "Do you know, I have never handled any virgin gold before. I had an idea that it was more brilliant and glittering. Is this very good stuff?" "Absolutely pure, I should say," Venner replied. "There are two ways of gold mining. One is by crushing quartz in machinery, as they do in South Africa, and the other is by obtaining the metal in what are called pockets or placers. This is the way in which it is generally found in Australia and Mexico. I should not be in the least surprised if this came from the Four Finger Mine." "There is no reason why it shouldn't," Gurdon said. "It is pretty evident, from what you told me last night, that Mark Fenwick has discovered the mysterious treasure house, but that does not account for all these proceedings. Why should he have taken all the trouble he did last night, when he might just as well have brought the stuff in, and taken the other boxes out by the front door?" "That is what we have to find out," Venner said. "That fellow may call himself a millionaire, but I believe he is nothing more nor less than a desperate adventurer." Gurdon nodded his assent. There must have been something very urgent to compel Mark Fenwick to adopt such methods. Why was he so strangely anxious to conceal the knowledge that he was receiving boxes of pure gold in the hotel, and that he was sending out something of equal value? However carefully the thing might have been planned the drugging of lift attendants must have been attended with considerable risk. And the slightest accident would have brought about a revelation. As it was, everything seemed to have passed off smoothly, except for the chance by which Gurdon had stumbled on the mystery. "We can't leave the thing here," the latter said. "For once in my life I am going to turn amateur detective. I have made up my mind to get into Fenwick's suite of rooms and see what is going on there. Of course, the thing will take time, and will have to be carefully planned. Do you think it is possible for us to make use of your wife in this matter?" "I don't think so," Venner said thoughtfully.