I could not repress a start of astonishment.

"Are you acting for Armand & Son?" I queried.

"Not at all. I am acting for a lady whom, for the present, we will call Madame X."

The thought flashed through my mind that Madame X. and the mysterious Frenchwoman might be one and the same person. Then I put aside the idea as absurd. Sereno Hornblower would never accept such a client.

"Mr. Vantine did buy such a cabinet," I said.

"And it is in your possession?"

"There is at his residence a Boule cabinet which was shipped him from Paris, but, only a few hours before his death, Mr. Vantine assured me that it was not the one he had purchased."

"You mean that a mistake had been made in the shipment?"

"That is what we supposed, and a cablegram from Armand & Son has since confirmed it."

Mr. Hornblower pondered this for a moment.