Then, exhibiting my Kodak, a 9 × 12 with which I had been photographing her in various poses, I added: “In an apparatus no larger than that, a person could hide all of Lady Jerland’s jewels. He could pretend to take pictures and no one would suspect the game.”

“But I have heard it said that every thief leaves some clue behind him.”

“That may be generally true,” I replied, “but there is one exception: Arsène Lupin.”

“Why?”

“Because he concentrates his thoughts not only on the theft, but on all the circumstances connected with it that could serve as a clue to his identity.”

“A few days ago, you were more confident.”

“Yes, but since I have seen him at work.”

“And what do you think about it now?” she asked.