He came out smiling.
"Well, have you found the key ?" cried the millionaire.
"No.

I haven't; but I've found something better," said Guerchard.
"What is it ?" said M.Formery sharply.
"I'll give you a hundred guesses," said Guerchard with a tantalizing smile.
"What is it ?" said M.Formery.
"A little present for you," said Guerchard.
"What do you mean ?" cried M.Formery angrily.
Guerchard held up a card between his thumb and forefinger and said quietly: "The card of Arsene Lupin.".