“It is his love diary?”

“Or his lust diary. Call it what you will. The moment the woman told us of it I realized what a tremendous weapon was there if we could but lay our hands on it. I said nothing at the time to indicate my thoughts, for this woman might have given it away. But I brooded over it. Then this assault upon me gave me the chance of letting the Baron think that no precautions need be taken against me. That was all to the good. I would have waited a little longer, but his visit to America forced my hand. He would never have left so compromising a document behind him. Therefore we had to act at once. Burglary at night is impossible. He takes precautions. But there was a chance in the evening if I could only be sure that his attention was engaged. That was where you and your blue saucer came in. But I had to be sure of the position of the book, and I knew I had only a few minutes in which to act, for my time was limited by your knowledge of Chinese pottery. Therefore I gathered the girl up at the last moment. How could I guess what the little packet was that she carried so carefully under her cloak? I thought she had come altogether on my business, but it seems she had some of her own.”

“He guessed I came from you.”

“I feared he would. But you held him in play just long enough for me to to get the book, though not long enough for an unobserved escape. Ah, Sir James, I am very glad you have come!”

Our courtly friend had appeared in answer to a previous summons. He listened with the deepest attention to Holmes’s account of what had occurred.

“You have done wonders — wonders!” he cried when he had heard the narrative. “But if these injuries are as terrible as Dr. Watson describes, then surely our purpose of thwarting the marriage is sufficiently gained without the use of this horrible book.”

Holmes shook his head.

“Women of the De Merville type do not act like that. She would love him the more as a disfigured martyr. No, no. It is his moral side, not his physical, which we have to destroy. That book will bring her back to earth — and I know nothing else that could. It is in his own writing. She cannot get past it.”

Sir James carried away both it and the precious saucer. As I was myself overdue, I went down with him into the street. A brougham was waiting for him. He sprang in, gave a hurried order to the cockaded coachman, and drove swiftly away. He flung his overcoat half out of the window to cover the armorial bearings upon the panel, but I had seen them in the glare of our fanlight none the less. I gasped with surprise. Then I turned back and ascended the stair to Holmes’s room.

“I have found out who our client is,” I cried, bursting with my great news. “Why, Holmes, it is —”

“It is a loyal friend and a chivalrous gentleman,” said Holmes, holding up a restraining hand. “Let that now and forever be enough for us.”

I do not know how the incriminating book was used. Sir James may have managed it. Or it is more probable that so delicate a task was entrusted to the young lady’s father. The effect, at any rate, was all that could be desired.

"Perhaps I'm in the way?" Lupin suggested.

"Not at all, doctor, not at all," said Daubrecq. "Besides, what I have to say has a certain bearing on your errand." And, into the telephone, "Hullo! M. Prasville?... Ah, it's you, Prasville, old cock!... Why, you seem quite staggered! Yes, you're right, it's an age since you and I met. But, after all, we've never been far away in thought... And I've had plenty of visits from you and your henchmen... In my absence, it's true. Hullo!... What?... Oh, you're in a hurry? I beg your pardon!... So am I, for that matter... Well, to come to the point, there's a little service I want to do you... Wait, can't you, you brute?... You won't regret it... It concerns your renown... Hullo!... Are you listening?... Well, take half-a-dozen men with you... plain-clothes detectives, by preference: you'll find them at the night-office... Jump into a taxi, two taxis, and come along here as fast as you can... I've got a rare quarry for you, old chap. One of the upper ten... a lord, a marquis Napoleon himself... in a word, Arsene Lupin!"

Lupin sprang to his feet. He was prepared for everything but this. Yet something within him stronger than astonishment, an impulse of his whole nature, made him say, with a laugh:

"Oh, well done, well done!"

Daubrecq bowed his head, by way of thanks, and muttered:

"I haven't quite finished... A little patience, if you don't mind." And he continued, "Hullo! Prasville!... No, no, old chap, I'm not humbugging... You'll find Lupin here, with me, in my study... Lupin, who's worrying me like the rest of you... Oh, one more or less makes no difference to me! But, all the same, this one's a bit too pushing. And I am appealing to your sense of kindness. Rid me of the fellow, do... Half-a-dozen of your satellites and the two who are pacing up and down outside my house will be enough... Oh, while you're about it, go up to the third floor and rope in my cook as well... She's the famous Victoire: you know, Master Lupin's old nurse... And, look here, one more tip, to show you how I love you: send a squad of men to the Rue Chateaubriand, at the corner of the Rue Balzac... That's where our national hero lives, under the name of Michel Beaumont... Do you twig, old cockalorum? And now to business. Hustle!"

When Daubrecq turned his head, Lupin was standing up, with clenched fists. His burst of admiration had not survived the rest of the speech and the revelations which Daubrecq had made about Victoire and the flat in the Rue Chateaubriand. The humiliation was too great; and Lupin no longer bothered to play the part of the small general practitioner. He had but one idea in his head: not to give way to the tremendous fit of rage that was urging him to rush at Daubrecq like a bull.

Daubrecq gave the sort of little cluck which, with him, did duty for a laugh. He came waddling up, with his hands in his trouser-pockets, and said, incisively:

"Don't you think that this is all for the best? I've cleared the ground, relieved the situation... At least, we now know where we stand. Lupin versus Daubrecq; and that's all about it. Besides, think of the time saved! Dr. Vernes, the divisional surgeon, would have taken two hours to spin his yarn! Whereas, like this, Master Lupin will be compelled to get his little story told in thirty minutes... unless he wants to get himself collared and his accomplices nabbed. What a shock! What a bolt from the blue! Thirty minutes and not a minute more. In thirty minutes from now, you'll have to clear out, scud away like a hare and beat a disordered retreat. Ha, ha, ha, what fun! I say, Polonius, you really are unlucky, each time you come up against Bibi Daubrecq! For it was you who were hiding behind that curtain, wasn't it, my ill-starred Polonius?"