Into the heavy shadows that swathe the feet of the tall buildings in West Fourteenth Street, New York, late in the evening there slipped a dark form. It was so carefully wrapped in a black cloak that it was difficult to tell among the other shadows whether it was man or woman, and immediately it became a part of the darkness that hovered close to the entrances along the way. It slid almost imperceptibly from shadow to shadow until it crouched flatly against the wall by the steps of an open door out of which streamed a wide band of light that flung itself across the pavement.