“Very funny! very funny!” exclaimed the detective.
At that moment the men, who had been sent to search the other rooms, returned and announced their failure to find anything. Lupin laughed and said:
“Parbleu! Did you expect to find my visiting list, or evidence of my business relations with the Emperor of Germany? But I can tell you what you should investigate, Ganimard: All the little mysteries of this apartment. For instance, that gas-pipe is a speaking tube. That chimney contains a stairway. That wall is hollow. And the marvellous system of bells! Ah! Ganimard, just press that button!”
Ganimard obeyed.
“Did you hear anything?” asked Lupin.
“No.”
“Neither did I. And yet you notified my aeronaut to prepare the dirigible balloon which will soon carry us into the clouds.”
“Come!” said Ganimard, who had completed his search; “we’ve had enough nonsense—let’s be off.”
He started away, followed by his men. Lupin did not move. His guardians pushed him in vain.
“Well,” said Ganimard, “do you refuse to go?”