She walked on quickly. Five minutes, ten minutes passed; and now, in a narrow street, lighted mostly by the dull, yellow glow that seeped up from the sidewalk through basement entrances, queer and forbidding portals to sinister interiors, or filtered through the dirty windows of uninviting little shops that ran the gamut from Chinese laundries to oyster dens, she halted, drawn back in the shadows of a doorway, and studied a tenement building that was just ahead of her. That was where old Nicky Viner lived. A smile of grim whimsicality touched her lips. Not a light showed in the place from top to bottom. From its exterior it might have been uninhabited, even long deserted. But to one who knew, it was quite the normal condition, quite what one would expect. Those who lived there confined their activities mostly to the night; and their exodus to their labors began when the labors of the world at large ended--with the fall of darkness. For a little while she watched the place, and kept glancing up and down the street; and then, seizing her opportunity when for half a block or more the street was free of pedestrians, she stole forward and reached the tenement door. It was half open, and she slipped quickly inside into the hall. She stood here for a moment motionless; listening, striving to accommodate her eyes to the darkness, and instinctively her hand went to her pocket for the reassuring touch of her revolver. It was black back there in the hallway of Gypsy Nan's lodging; she had not thought that any greater degree of blackness could exist; but it was blacker here. Only the sense of touch promised to be of any avail. If one could have moved as noiselessly as a shadow moves, one could have passed another within arm's-length unseen. And so she listened, listened intently. And there was very little sound. Once she detected a footstep from the interior of some room as it moved across a bare floor; once she heard a door creak somewhere upstairs; and once, from some indeterminate direction, she thought she heard voices whispering together for a moment. She moved suddenly then, abruptly, almost impulsively, but careful not to make the slightest noise. She dared not remain another instant inactive. It was what she had expected, what she had counted upon as an ally, this darkness, but she was not one who laughed, even in daylight, at its psychology. It was beginning to attack her now; her imagination to magnify even the actual dangers that she knew to be around her. And she must fight it off before it got a hold upon her, and before panic voices out of the blackness began to shriek and clamor in her ears, as she knew they would do with pitifully little provocation, urging her to turn and flee incontinently.