For answer the criminologist pointed to the ground; sharply indented in the sod were the marks of a small, high heeled shoe; and Scanlon stood staring at them perplexed.
"What do they signify?" asked he. "There are likely to be footprints all over the place—male and female. I'll venture to say that half the residents of the street have been prowling about in this space since the murder was done."
"That is a possibility always to be guarded against," said Ashton-Kirk, quietly. "But there has been a policeman on guard all the time, so, you see, the chances are greatly reduced." He studied the narrow imprints with great care; they were firmly pressed into the damp sod, the high heels making a decided puncture. "The night before last was a bright one," he added, finally, as he straightened up and looked at Scanlon. "At about the time the murder was committed the moon hung about there, full and unobstructed, if you remember. Now, suppose you, for some secret reason, entered the grounds at that time. The whole space on this side was flooded with light; and yet you desired to get a view of what was going on in the sitting-room; at the same time you were most anxious not to be seen. What would you be most likely to do?"
Scanlon looked around and considered.
"About the only thing to do in a case like that," said he, "would be to take cover behind this rose arbor."
"Right!" approved the investigator. "And now, consider: once behind it, the only place from which you could fully overlook the window desired would be here," indicating a certain spot; "the vine has 'made wood' too heavily at all the other points to permit of uninterrupted vision. And right here, you will notice these footprints are the most often repeated; they are also deeper, showing that the woman, whoever she was, stood here for some little time."
Scanlon was impressed; but at the same time there was a dubious look in his eye.
"A woman did stand there," he agreed; "and maybe she was looking in at the window. But what do you draw from that?"
"Nothing—as yet. We'll just note the fact, old chap, and pass on to the next. Later we'll put the two together, and see if any meaning is to be had from the combination."