he had found a way of escape which rendered him for the time being safe from discovery. But there was another possible miscalculation which he felt it his duty to recognize before he proceeded further in his difficult task. The bow found back of the tapestry had every appearance of being the one used for the delivery of the arrow. But was it? Might it not, in some strange and unaccountable way, have been flung there previous to the present event and by some hand no longer in the building? Such coincidences have been known, and while as a rule this old and experienced detective put little confidence in coincidences of any kind, he had but one thought in mind in approaching this final witness, which was to get from him some acknowledgment of having seen, on or about the time of the accident, a movement in the tapestry behind which this bow lay concealed. If once this fact could be established, there could be no further question as to the direct connection between the bow there found and the present crime.

But Mr. Gryce might have spared his pains, so far as this young man was concerned. He had been so engrossed in his search for a particularly rare coin, that he had had no eyes for anything beyond. Besides, he was abnormally nearsighted, not being able, even with his glasses, to distinguish faces at any distance, much less a movement in a piece of tapestry.

All of this was discouraging, even if anticipated; but there were still the people below, some one of whom might have seen what this man had not. He would go down to them now, but by a course which would incidentally enlighten him in regard to another matter about which he had some doubts.

In his goings to and fro through the hall, he had passed the open door of Room H and noted how easily a direct flight could be made through it and Rooms I and J to the small staircase running down at the rear. Whether or not this explained the absence of anyone on this floor