“The door from the drawing room to the library was open.  The Harvard don was going out, the one Nute had employed to get up his thesis for the Royal Society of London — I mentioned him a while ago.  And I heard his final remark, flung back at the door. `What you require, Sir, is the example case of some new exploration — one that you have yourself conducted.’

“That bucked me; the devil was on the job!”

Barclay stopped again.  He sat for a moment watching the smoke from the cigarette climb in a blue mist slowly into the beautiful fresco of the ceiling.

“I told old Nute precisely what I’ve told you.  How I’d backed Tavor for his last adventure, and where he’d been; all over Central Mongolia and finally across the Great Sandy Desert of El-Khali.  And I told him what Charlie was after; the theory he started with and his final conclusion when he made his last push along the old caravan route west from Muscat.

“I went into the details, and the big notion that Tavor had slowly pieced together; how the gold was mined in the ranges south of Siberia, carried in green skins to lower Mongolia, melted there and taken for trade Southwest across the El-Khali to an immense Babylon of Commerce of which the present Mecca is perhaps a decadent residuum.

“I put it all in; the accessibility of this desert from the coast on three sides, how the old caravan route parallels the thirty-third meridian and how Charlie struck it four hundred miles out into the desert in a hundred miles travel due south in longitude between 50 and 55 degrees; all the details of Tavor’s hunt for the wreck of one of these treasure caravans.

“Old Nute looked at me with his little hard eyes slipping about.

“‘And he didn’t find it?’ he said.

“I didn’t answer that.  I went ahead and told him how I found Tavor and the shape he was in, and then I added, `I’m not an explorer, and Charlie can’t go back.’

“Old Nute’s thick neck shot out at that.

“‘Then he did find it?’ he said.

“‘Now look here, Nute,’ I said, `you’re not trading with Tavor on this deal.  You’re trading with me and I’m just as slick as you are.  You’ll get no chance to slip under on this.  You forget all I’ve told you just as though it had nothing to do with what I’m going to tell you, and I’ll come to the point.’

“`Forget it?’ he said.

“‘Yes,’ I said, `forget it.  I’m not going to put you on to what Charlie knows, with any strings to it, or with any pointers that you can run down without us.  I’ve told you all about Tavor’s big hunt through the Shamo and the El-Khali for a purpose of my own and not for the purpose of enabling you to locate the thing that Charlie Tavor knows about.’

“Hardman’s voice went down into a low note. `What does he know?’ he said.

“I looked him squarely in the little reptilian eyes. `He knows where there is a treasure in gold equal in our money to three hundred thousand dollars!’