The Inspector, finding himself very much disturbed by the doubt just mentioned, felt inclined to question whether any perceptible advancement had been made by this freak business of his canny subordinate. He was hardly ready to say yes, and was not a little surprised when on his way toward the head of the staircase he heard the exultant voice of Mr. Gryce whisper in his ear:
"That's all right. We've gained a point. We know now the exact place from which the arrow was shot."
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