The interview was at an end, and Mon. Dudouis was about to leave the room when a most annoying incident occurred. Madame Réal turned to Ganimard, and said:

“I understand that you are Monsieur Ganimard. Am I right?”

“Yes.”

“Then, this letter must be for you. I received it this morning. It was addressed to ‘Mon. Justin Ganimard, care of Madame Réal.’ I thought it was a joke, because I did not know you under that name, but it appears that your unknown correspondent knew of our rendezvous.”

Ganimard was inclined to put the letter in his pocket unread, but he dared not do so in the presence of his superior, so he opened the envelope and read the letter aloud, in an almost inaudible tone:

“Once upon a time, there were a blonde Lady, a Lupin, and a Ganimard. Now, the wicked Ganimard had evil designs on the pretty blonde Lady, and the good Lupin was her friend and protector. When the good Lupin wished the blonde Lady to become the friend of the Countess de Crozon, he caused her to assume the name of Madame de Réal, which is a close resemblance to the name of a certain diamond broker, a woman with a pale complexion and golden hair. And the good Lupin said to himself: If ever the wicked Ganimard gets upon the track of the blonde Lady, how useful it will be to me if he should be diverted to the track of the honest diamond broker. A wise precaution that has borne good fruit. A little note sent to the newspaper read by the wicked Ganimard, a perfume bottle intentionally forgotten by the genuine blonde Lady at the Hôtel Beaurivage, the name and address of Madame Réal written on the hotel register by the genuine blonde Lady, and the trick is played. What do you think of it, Ganimard? I wished to tell you the true story of this affair, knowing that you would be the first to laugh over it. Really, it is quite amusing, and I have enjoyed it very much.
“Accept my best wishes, dear friend, and give my kind regards to the worthy Mon. Dudouis.

“ARSÈNE LUPIN.”

“He knows everything,” muttered Ganimard, but he did not see the humor of the situation as Lupin had predicted. “He knows some things I have never mentioned to any one. How could he find out that I was going to invite you here, chief? How could he know that I had found the first perfume bottle? How could he find out those things?”

He stamped his feet and tore his hair—a prey to the most tragic despair. Mon. Dudouis felt sorry for him, and said:

“Come, Ganimard, never mind; try to do better next time.”