"Ah, you see the big mistake we made,--Correy and all the rest of us. Had Miss Willetts, or I should say, Mademoiselle Duclos, been the one to let out that dolorous cry, the man just behind the partition would have been there almost in time to see her fall. Correy, who started up the stairs at the first sound, would have been at the gallery entrance before the man of the arrow could have dropped the hanging over his retreating figure. But it was not from her lips, poor girl, that this gasping shriek went up, but from those of the woman who saw the deed and knew from whom the arrow came and for whom it was meant. How do I know this? Because of the time which elapsed, the few precious minutes which allowed Mr. Roberts to get as far away as the court. For she did not voice her agony immediately. Even she, with her own unwounded heart keeping up its functions, stood benumbed before this horror. Not till the full meaning of it all had penetrated her reluctant brain did she move or cry out. How long this interval was; whether three minutes were consumed by it, or five, we have no means of telling. She, in her despair, would take no note of time, nor would Mr. Travis, reeling in the opposite gallery under the shock of seeing all that he loved taken from him in one awful minute." Here the detective turned with great earnestness toward the two officials. "This question of time has been, as I have repeatedly said, the greatest stumbling-block we have encountered in our consideration of this crime. How could the assassin, by any means possible, have got so far away from the pedestal, in the infinitesimal lapse of time between the cry that was heard and the quick alarm which followed. Now we know. Have you anything to say against this conclusion? Any other explanation to give which will account for every fact as this does?" His answer came in a dubious gesture from the District Attorney and a half-hearted "No" from his Assistant. They were both either too awed by the circumstance or too fearful of mistake, to accept without a struggle an accusation of this grave and momentous character against one of Mr. Roberts' stamp and consequence. This was no more than Mr. Gryce had expected, and while he realized that his reputation as a detective of extraordinary insight in cases of an unusually baffling nature trembled in the balance, he experienced a sudden distaste of his work which almost drove him into renouncing the whole affair. But the habits of a lifetime are not parted with so easily; and when the Chief Inspector observed--evidently with the idea of goading him on--"This seems to be mainly a matter of conjecture, Gryce," his old self reasserted itself, and he answered boldly: