The quick report of a pistol rang through the quiet autumn night. It was no unusual sound in the unsavory quarter where Dr. Chevalier had his office. Screams commonly went with it. This time there had been none. Midnight had already rung in the old cathedral tower. The doctor closed the book over which he had lingered so late, and awaited the summons that was almost sure to come. As he entered the house to which he had been called he could not but note the ghastly sameness of detail that accompanied these oft-recurring events. The same scurrying; the same groups of tawdry, frightened women