“We changed him to another cell after his attempted escape.”

“But you, monsieur, you have seen him during those two months?”

“I had no occasion to see him. He was always quiet and orderly.”

“And this prisoner is not Arsène Lupin?”

“No.”

“Then who is he?” demanded the judge.

“I do not know.”

“Then we have before us a man who was substituted for Arsène Lupin, two months ago. How do you explain that?”

“I cannot.”

In absolute despair, the judge turned to the accused and addressed him in a conciliatory tone: