“But true ones. Look! What are they doing? Searching for subterranean passages, stones swinging on pivots, and other nonsense of that kind. But Lupin doesn’t employ such old-fashioned methods. He is a modern cracksman, right up to date.”

“And how would you proceed?”

“I should ask your permission to spend an hour with him.”

“In his cell?”

“Yes. During the return trip from America we became very friendly, and I venture to say that if he can give me any information without compromising himself he will not hesitate to save me from incurring useless trouble.”

It was shortly after noon when Ganimard entered the cell of Arsène Lupin. The latter, who was lying on his bed, raised his head and uttered a cry of apparent joy.

“Ah! This is a real surprise. My dear Ganimard, here!”