"That's where the whole problem lies. Where are the notes? If we could lay our hands on them, we should know everything."
At the Brasserie Lutetia there was a telephone in the private room where he asked to have lunch served. When the waiter had left him alone with Hortense and Dutreuil, he took down the receiver with a resolute air:
"Hullo!... Prefecture of police, please.... Hullo! Hullo!... Is that the Prefecture of police? Please put me on to the criminal investigation department. I have a very important communication to make. You can say it's Prince Rénine."
Holding the receiver in his hand, he turned to Gaston Dutreuil:
"I can ask some one to come here, I suppose? We shall be quite undisturbed?"
"Quite."
He listened again:
"The secretary to the head of the criminal investigation department? Oh, excellent! Mr. Secretary, I have on several occasions been in communication with M. Dudouis and have given him information which has been of great use to him. He is sure to remember Prince Rénine. I may be able to-day to show him where the sixty thousand-franc notes are hidden which Aubrieux the murderer stole from his cousin. If he's interested in the proposal, beg him to send an inspector to the Brasserie Lutetia, Place des Ternes. I shall be there with a lady and M. Dutreuil, Aubrieux's friend. Good day, Mr. Secretary."
When Rénine hung up the instrument, he saw the amazed faces of Hortense and of Gaston Dutreuil confronting him.
Hortense whispered: