“You agree, Monsieur, with this view? You feel certain that the Comte de la Roche is the murderer?”

“Why, it would seem so⁠—yes, certainly.”

Something guarded in the answer made the Examining Magistrate look at the American curiously. Van Aldin seemed aware of his scrutiny and made an effort as though to shake off some preoccupation.

“What about my son-in-law?” he asked. “You have acquainted him with the news? He is in Nice, I understand.”

“Certainly, Monsieur.” The Commissary hesitated, and then murmured very discreetly: “You are doubtless aware, M. Van Aldin, that M. Kettering was also one of the passengers on the Blue Train that night?”

The millionaire nodded.