"After that performance of yours, Mr. Faraday," he confessed, "I really don't know what to say. I seem to have a horrible vision of watching my tiaras come out through the steel doors, and my pink pearls drop out from the ceiling into your waistcoat pocket."

Faraday did not smile. It seemed to me that he was very much in earnest.

"I will undertake to refrain from any extempore performance," he said. "As a matter of fact, your Grace, there are limitations to my magic."

The Duke turned away. He seemed rather to resent the other's persistence.

"Another time, perhaps," he promised, a little coldly. "My party to-night is made up."

Faraday was standing a little in the shadows and I watched him eagerly. From that moment our mission to Lorringham Castle seemed to become clearer to me.

An hour or so later, our host led a small company of us to the treasure chamber. We paused outside a green baize door leading into one of the galleries, which was guarded by a servant in the livery of the house. The Duke, with a word of apology, took off his coat and rolled up his shirt sleeves, disclosing a plain platinum band around his arm.

"This is an American idea," he explained.

He touched a spring in the band, one side opened and disclosed a key, attached to a thin chain of platinum wire. With this he unlocked the door of a small chamber, brilliantly lit. One side of the room seemed to be composed, up to the height of about six feet, of solid steel shutters. The Duke fitted the other end of the key into a concealed crevice. There was a little click, and the whole of the shutters rolled back. From behind windows of solid plate-glass, on a background of black velvet, were displayed the famous tiaras, rows of marvellous pearls, some of them as large as marbles and pink as sea coral, and a further collection of magnificent jewellery. There seemed to be an almost universal gasp of astonishment. The women of the party especially were speechless.