CHAPTER XVII

      SONIA'S ESCAPE

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      "One of M. Formery's innocents," said Guerchard, turning to the Duke.

      "The chalk?" said the Duke. "Is it the same chalk?"

      "It's blue," said Guerchard, holding it out. "The same as that of the signatures on the walls. Add that fact to the woman's sudden realization of what she was doing, and you'll see that they were written with it."

      "It is rather a surprise," said the Duke. "To look at her you would think that she was the most honest woman in the world."

      "Ah, you don't know Lupin, your Grace," said Guerchard. "He can do anything with women; and they'll do anything for him. And, what's more, as far as I can see, it doesn't make a scrap of difference whether they're honest or not. The fair-haired lady I was telling you about was probably an honest woman; Ganimard is sure of it. We should have found out long ago who she was if she had been a wrong 'un. And Ganimard also swears that when he arrested Lupin on board the Provence some woman, some ordinary, honest woman among the passengers, carried away Lady Garland's jewels, which he had stolen and was bringing to America, and along with them a matter of eight hundred pounds which he had stolen from a fellow-passenger on the voyage."

      "That power of fascination which some men exercise on women is one of those mysteries which science should investigate before it does anything else," said the Duke, in a reflective tone. "Now I come to think of it, I had much better have spent my time on that investigation than on that tedious journey to the South Pole. All the same, I'm deucedly sorry for that woman, Victoire. She looks such a good soul."

      Guerchard shrugged his shoulders: "The prisons are full of good souls," he said, with cynical wisdom born of experience. "They get caught so much more often than the bad."

      "It seems rather mean of Lupin to make use of women like this, and get them into trouble," said the Duke.

      "But he doesn't," said Guerchard quickly. "At least he hasn't up to now. This Victoire is the first we've caught. I look on it as a good omen."

      He walked across the room, picked up his cloak, and took a card-case from the inner pocket of it. "If you don't mind, your Grace, I want you to show this permit to my men who are keeping the door, whenever you go out of the house. It's just a formality; but I attach considerable importance to it, for I really ought not to make exceptions in favour of any one. I have two men at the door, and they have orders to let nobody out without my written permission. Of course M. Gournay-Martin's guests are different. Bonavent has orders to pass them out. And, if your Grace doesn't mind, it will help me. If you carry a permit, no one else will dream of complaining of having to do so."

      "Oh, I don't mind, if it's of any help to you," said the Duke cheerfully.

      "Thank you," said Guerchard. And he wrote on his card and handed it to the Duke.

      The Duke took it and looked at it. On it was written:

      "Pass the Duke of Charmerace."

       "J. GUERCHARD."

      "It's quite military," said the Duke, putting the card into his waistcoat pocket.

      There came a knock at the door, and a tall, thin, bearded man came into the room.

      "Ah, Dieusy! At last! What news?" cried Guerchard.

      Dieusy saluted: "I've learnt that a motor-van was waiting outside the next house—in the side street," he said.

      "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