"At what time?" said Guerchard.

"Between four and five in the morning," said Dieusy.

"Who saw it?" said Guerchard.

"A scavenger. He thinks that it was nearly five o'clock when the van drove off."

"Between four and five--nearly five. Then they filled up the opening before they loaded the van. I thought they would," said Guerchard, thoughtfully. "Anything else?"

"A few minutes after the van had gone a man in motoring dress came out of the house," said Dieusy.

"In motoring dress?" said Guerchard quickly.

"Yes. And a little way from the house he threw away his cigarette. The scavenger thought the whole business a little queer, and he picked up the cigarette and kept it. Here it is."

He handed it to Guerchard, whose eyes scanned it carelessly and then glued themselves to it.

"A gold-tipped cigarette ... marked Mercedes ... Why, your Grace, this is one of your cigarettes!"

"But this is incredible!" cried the Duke.

"Not at all," said Guerchard. "It's merely another link in the chain.

I've no doubt you have some of these cigarettes at Charmerace."

"Oh, yes, I've had a box on most of the tables," said the Duke.

"Well, there you are," said Guerchard.

"Oh, I see what you're driving at," said the Duke. "You mean that one of the Charolais must have taken a box."

"Well, we know that they'd hardly stick at a box of cigarettes," said Guerchard.

"Yes ... but I thought ..." said the Duke; and he paused.

"You thought what?" said Guerchard.

"Then Lupin ... since it was Lupin who managed the business last night--since you found those salvias in the house next door ... then Lupin came from Charmerace."

"Evidently," said Guerchard.

"And Lupin is one of the Charolais."

"Oh, that's another matter," said Guerchard.

"But it's certain, absolutely certain," said the Duke. "We have the connecting links ... the salvias ... this cigarette."

"It looks very like it. You're pretty quick on a scent, I must say,"

said Guerchard. "What a detective you would have made! Only ... nothing is certain."

"But it IS. Whatever more do you want? Was he at Charmerace yesterday, or was he not? Did he, or did he not, arrange the theft of the motor-cars?"

"Certainly he did. But he himself might have remained in the background all the while," said Guerchard.

"In what shape? ... Under what mask? ... By Jove, I should like to see this fellow!" said the Duke.

"We shall see him to-night," said Guerchard.

"To-night?" said the Duke.

"Of course we shall; for he will come to steal the coronet between a quarter to twelve and midnight," said Guerchard.

"Never!" said the Duke. "You don't really believe that he'll have the cheek to attempt such a mad act?"

"Ah, you don't know this man, your Grace ... his extraordinary mixture of coolness and audacity. It's the danger that attracts him. He throws himself into the fire, and he doesn't get burnt. For the last ten years I've been saying to myself, 'Here we are: this time I've got him! ...

At last I'm going to nab him.' But I've said that day after day," said Guerchard; and he paused.

"Well?" said the Duke.

"Well, the days pa.s.s; and I never nab him. Oh, he is thick, I tell you.... He's a joker, he is ... a regular artist"--he ground his teeth--"The d.a.m.ned thief!"

The Duke looked at him, and said slowly, "Then you think that to-night Lupin--"

"You've followed the scent with me, your Grace," Guerchard interrupted quickly and vehemently. "We've picked up each clue together. You've almost seen this man at work.... You've understood him. Isn't a man like this, I ask you, capable of anything?"

"He is," said the Duke, with conviction.

"Well, then," said Guerchard.

"Perhaps you're right," said the Duke.

Guerchard turned to Dieusy and said, in a quieter voice, "And when the scavenger had picked up the cigarette, did he follow the motorist?"

"Yes, he followed him for about a hundred yards. He went down into Sureau Street, and turned westwards. Then a motor-car came along; he got into it, and went off."

"What kind of a motor-car?" said Guerchard.

"A big car, and dark red in colour," said Dieusy.

"The Limousine!" cried the Duke.

"That's all I've got so far, sir," said Dieusy.

"Well, off you go," said Guerchard. "Now that you've got started, you'll probably get something else before very long."

Dieusy saluted and went.

"Things are beginning to move," said Guerchard cheerfully. "First Victoire, and now this motor-van."