“Oh! oh! And where will he hide?”

I looked at my watch, and said:

“At the present moment, Arsène Lupin is prowling around the station at Darnétal. At ten fifty, that is, in twenty-two minutes from now, he will take the train that goes from Rouen to Amiens.”

“Do you think so? How do you know it?”

“Oh! it is quite simple. While we were in the car, Arsène Lupin consulted my railway guide. Why did he do it? Was there, not far from the spot where he disappeared, another line of railway, a station upon that line, and a train stopping at that station? On consulting my railway guide, I found such to be the case.”

“Really, monsieur,” said the commissary, “that is a marvelous deduction. I congratulate you on your skill.”