Stanley Hopkins and I stared in amazement. Something like a sneer quivered over the gaunt features of the old professor.

“Indeed! In the garden?”

“No, here.”

“Here! When?”

“This instant.”

“You are surely joking, Mr. Sherlock Holmes. You compel me to tell you that this is too serious a matter to be treated in such a fashion.”

“I have forged and tested every link of my chain, Professor Coram, and I am sure that it is sound. What your motives are, or what exact part you play in this strange business, I am not yet able to say. In a few minutes I shall probably hear it from your own lips. Meanwhile I will reconstruct what is past for your benefit, so that you may know the information which I still require.

“A lady yesterday entered your study. She came with the intention of possessing herself of certain documents which were in your bureau. She had a key of her own. I have had an opportunity of examining yours, and I do not find that slight discolouration which the scratch made upon the varnish would have produced. You were not an accessory, therefore, and she came, so far as I can read the evidence, without your knowledge to rob you.”

The professor blew a cloud from his lips. “This is most interesting and instructive,” said he. “Have you no more to add? Surely, having traced this lady so far, you can also say what has become of her.”

“I will endeavour to do so. In the first place she was seized by your secretary, and stabbed him in order to escape. This catastrophe I am inclined to regard as an unhappy accident, for I am convinced that the lady had no intention of inflicting so grievous an injury. An assassin does not come unarmed. Horrified by what she had done, she rushed wildly away from the scene of the tragedy. Unfortunately for her, she had lost her glasses in the scuffle, and as she was extremely shortsighted she was really helpless without them. She ran down a corridor, which she imagined to be that by which she had come - both were lined with cocoanut matting - and it was only when it was too late that she understood that she had taken the wrong passage, and that her retreat was cut off behind her. What was she to do? She could not go back. She could not remain where she was. She must go on. She went on. She mounted a stair, pushed open a door, and found herself in your room.”

The old man sat with his mouth open, staring wildly at Holmes. Amazement and fear were stamped upon his expressive features. Now, with an effort, he shrugged his shoulders and burst into insincere laughter.

“All very fine, Mr. Holmes,” said he. “But there is one little flaw in your splendid theory. I was myself in my room, and I never left it during the day.”

“I am aware of that, Professor Coram.”

“And you mean to say that I could lie upon that bed and not be aware that a woman had entered my room?”

“I never said so. You were aware of it. You spoke with her. You recognized her. You aided her to escape.”

Again the professor burst into high-keyed laughter. He had risen to his feet, and his eyes glowed like embers.

“You are mad!” he cried. “You are talking insanely. I helped her to escape? Where is she now?”

“She is there,” said Holmes, and he pointed to a high bookcase in the corner of the room.

I saw the old man throw up his arms, a terrible convulsion passed over his grim face, and he fell back in his chair. At the same instant the bookcase at which Holmes pointed swung round upon a hinge, and a woman rushed out into the room. “You are right!” she cried, in a strange foreign voice. “You are right! I am here.”