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He unfolded the rough chart, which I here reproduce,

GRAPHIC

and he laid it across Holmes’s knee. I rose and, standing behind Holmes, studied it over his shoulder.

“It is very rough, of course, and it only deals with the points which seem to me to be essential. All the rest you will see later for yourself. Now, first of all, presuming that the assassin entered the house, how did he or she come in? Undoubtedly by the garden path and the back door, from which there is direct access to the study. Any other way would have been exceedingly complicated. The escape must have also been made along that line, for of the two other exits from the room one was blocked by Susan as she ran downstairs and the other leads straight to the professor’s bedroom. I therefore directed my attention at once to the garden path, which was saturated with recent rain, and would certainly show any footmarks.

“My examination showed me that I was dealing with a cautious and expert criminal. No footmarks were to be found on the path. There could be no question, however, that someone had passed along the grass border which lines the path, and that he had done so in order to avoid leaving a track. I could not find anything in the nature of a distinct impression, but the grass was trodden down, and someone had undoubtedly passed. It could only have been the murderer, since neither the gardener nor anyone else had been there that morning, and the rain had only begun during the night.”

“One moment,” said Holmes. “Where does this path lead to?”

“To the road.”

“How long is it?”

“A hundred yards or so.”

“At the point where the path passes through the gate, you could surely pick up the tracks?”

“Unfortunately, the path was tiled at that point.”

“Well, on the road itself?”

“No, it was all trodden into mire.”

“Tut-tut! Well, then, these tracks upon the grass, were they coming or going?”

“It was impossible to say. There was never any outline.”

“A large foot or a small?”

“You could not distinguish.”

Holmes gave an ejaculation of impatience.

“It has been pouring rain and blowing a hurricane ever since,” said he. “It will be harder to read now than that palimpsest. Well, well, it can’t be helped. What did you do, Hopkins, after you had made certain that you had made certain of nothing?”

“I think I made certain of a good deal, Mr. Holmes. I knew that someone had entered the house cautiously from without. I next examined the corridor. It is lined with cocoanut matting and had taken no impression of any kind. This brought me into the study itself. It is a scantily furnished room. The main article is a large writing-table with a fixed bureau. This bureau consists of a double column of drawers, with a central small cupboard between them. The drawers were open, the cupboard locked. The drawers, it seems, were always open, and nothing of value was kept in them. There were some papers of importance in the cupboard, but there were no signs that this had been tampered with, and the professor assures me that nothing was missing. It is certain that no robbery has been committed.

“I come now to the body of the young man. It was found near the bureau, and just to the left of it, as marked upon that chart. The stab was on the right side of the neck and from behind forward, so that it is almost impossible that it could have been self-inflicted.”

“Unless he fell upon the knife,” said Holmes.

“Exactly. The idea crossed my mind. But we found the knife some feet away from the body, so that seems impossible. Then, of course, there are the man’s own dying words. And, finally, there was this very important piece of evidence which was found clasped in the dead man’s right hand.”

From his pocket Stanley Hopkins drew a small paper packet. He unfolded it and disclosed a golden pince-nez, with two broken ends of black silk cord dangling from the end of it. “Willoughby Smith had excellent sight,” he added. “There can be no question that this was snatched from the face or the person of the assassin.”