In a few words I explained exactly what had occurred, so far as the vitriol attack was concerned. Some had climbed through the window and others had rushed out on to the lawn, but it was dark and it had begun to rain. Between his screams the victim raged and raved against the avenger. “It was that hell-cat, Kitty Winter!” he cried. “Oh, the she-devil! She shall pay for it! She shall pay! Oh, God in heaven, this pain is more than I can bear!”

I bathed his face in oil, put cotton wadding on the raw surfaces, and administered a hypodermic of morphia. All suspicion of me had passed from his mind in the presence of this shock, and he clung to my hands as if I might have the power even yet to clear those dead-fish eyes which gazed up at me. I could have wept over the ruin had I not remembered very clearly the vile life which had led up to so hideous a change. It was loathsome to feel the pawing of his burning hands, and I was relieved when his family surgeon, closely followed by a specialist, came to relieve me of my charge. An inspector of police had also arrived, and to him I handed my real card. It would have been useless as well as foolish to do otherwise, for I was nearly as well known by sight at the Yard as Holmes himself. Then I left that house of gloom and terror. Within an hour I was at Baker Street.

Holmes was seated in his familiar chair, looking very pale and exhausted. Apart from his injuries, even his iron nerves had been shocked by the events of the evening, and he listened with horror to my account of the Baron’s transformation.

“The wages of sin, Watson - the wages of sin!” said he. “Sooner or later it will always come. God knows, there was sin enough,” he added, taking up a brown volume from the table. “Here is the book the woman talked of. If this will not break off the marriage, nothing ever could. But it will, Watson. It must. No self-respecting woman could stand it.”

“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 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.