“Only in colour. His face was - how shall I describe it? - it was of a fish - belly whiteness. It was bleached.”

“Was it equally pale all over?”

“I think not. It was his brow which I saw so clearly as it was pressed against the window.”

“Did you call to him?”

“I was too startled and horrified for the moment. Then I pursued him, as I have told you, but without result.”

My case was practically complete, and there was only one small incident needed to round it off. When, after a considerable drive, we arrived at the strange old rambling house which my client had described, it was Ralph, the elderly butler, who opened the door. I had requisitioned the carriage for the day and had asked my elderly friend to remain within it unless we should summon him. Ralph, a little wrinkled old fellow, was in the conventional costume of black coat and pepper-and-salt trousers, with only one curious variant. He wore brown leather gloves, which at sight of us he instantly shuffled off, laying them down on the hall-table as we passed in. I have, as my friend Watson may have remarked, an abnormally acute set of senses, and a faint but incisive scent was apparent. It seemed to centre on the hall-table. I turned, placed my hat there, knocked it off, stooped to pick it up, and contrived to bring my nose within a foot of the gloves. Yes, it was undoubtedly from them that the curious tarry odour was oozing. I passed on into the study with my case complete. Alas, that I should have to show my hand so when I tell my own story! It was by concealing such links in the chain that Watson was enabled to produce his meretricious finales.

Colonel Emsworth was not in his room, but he came quickly enough on receipt of Ralph’s message. We heard his quick, heavy step in the passage. The door was flung open and he rushed in with bristling beard and twisted features, as terrible an old man as ever I have seen. He held our cards in his hand, and he tore them up and stamped on the fragments.

“Have I not told you, you infernal busybody, that you are warned off the premises? Never dare to show your damned face here again. If you enter again without my leave I shall be within my rights if I use violence. I’ll shoot you, sir! By God, I will! As to you, sir,” turning upon me, “I extend the same warning to you. I am familiar with your ignoble profession, but you must take your reputed talents to some other field. There is no opening for them here.”

“I cannot leave here,” said my client firmly, “until I hear from Godfrey’s own lips that he is under no restraint.”

Our involuntary host rang the bell.

“Ralph,” he said, “telephone down to the county police and ask the inspector to send up two constables. Tell him there are burglars in the house.”

“One moment,” said I. “You must be aware, Mr. Dodd, that Colonel Emsworth is within his rights and that we have no legal status within his house. On the other hand, he should recognize that your action is prompted entirely by solicitude for his son. I venture to hope that if I were allowed to have five minutes’ conversation with Colonel Emsworth I could certainly alter his view of the matter.”

“I am not so easily altered,” said the old soldier. “Ralph, do what I have told you. What the devil are you waiting for? Ring up the police!”

“Nothing of the sort,” I said, putting my back to the door. “Any police interference would bring about the very catastrophe which you dread.” I took out my notebook and scribbled one word upon a loose sheet. “That,” said I as I handed it to Colonel Emsworth, “is what has brought us here.”

He stared at the writing with a face from which every expression save amazement had vanished.

“How do you know?” he gasped, sitting down heavily in his chair.