There was a smile of triumph on his face, from which I gathered instantly that he had been successful. He carried a black leather bag in his hand, and this he opened as soon as the waiter had gone out, saying, as he produced a brown-paper packet:

“I’m glad to say, Mr Kennedy, that I’ve been able to do the trick. It was a very delicate matter, and the affair presented features and difficulties I had never anticipated.”

“Then you’ve actually got it?” I cried eagerly, opening the parcel and displaying the precious volume.

“There it is, as you see,” he laughed. “Only please don’t ask how I got possession of it, because I’d rather not say—you understand.”

Detectives are apt to be mysterious sometimes, therefore I did not question him further. For me it was sufficient that he had been able to secure it without the thieves knowing into whose possession it had passed. I was well aware of the great circle of criminal acquaintances Noyes had in London, and I suspected that it was through one of them that the book had been obtained.

“I wired twice to you,” I said, when at my invitation he seated himself at the table to join me at dinner.

“I know,” was his response. “It was not necessary to reply. In such a case as this patience is everything. You were just a trifle too impatient, Mr Kennedy—if you’ll pardon me saying it. I had promised to do what I could, and did so, with the result you see.”

I know I deserved this quiet reproof, and admitted it, for patience is one of the many good qualities I do not possess.

He would explain nothing of the means by which he had obtained my property, although he told me one or two strange facts concerning Selby and the little old lady who had travelled from Paris.

“I’ve seen Selby,” he said. “At first I seemed to have a faint idea that I’d seen his face before, and that he was wanted for something. But I’ve searched at the Yard, and found no photograph resembling him, so I suppose I must be mistaken. The old woman’s name is Mrs Pickard. She knows several foreigners living at different places, mostly people in good circumstances.”