Markham tactfully changed the subject.

“What I came particularly to tell you, professor, is that Mr. Sperling called a short time ago and, when informed of Mr. Robin’s death, confessed to having done it himself. . . .”

“Raymond confessed!” gasped Miss Dillard.

Markham looked at the girl sympathetically.

“To be quite frank, I didn’t believe Mr. Sperling. Some mistaken idea of chivalry undoubtedly led him to admit the crime.”

“ ‘Chivalry’?” she repeated, leaning forward tensely. “What exactly do you mean by that, Mr. Markham?”

It was Vance who answered.

“The bow that was found on the range was a woman’s bow.”

“Oh!” The girl covered her face with her hands, and her body shook with sobs.

Professor Dillard regarded her helplessly; and his impotency took the form of irritation.