Kouka visited the tenderloin and learned that Archie had not left town. He learned, too, that he had a companion, and though he could follow the trail no farther, he had decided to watch Archie’s home in the chance that the boy might visit it some time during the night. And now, for two hours, in the patience that was part of his stupidity, he had lurked in the black doorway of the grocery. Bolt Street was dark and still. Overhead, low clouds were flying; and the old stool-pigeon, coming later and later each night, as if bad habits were growing on it, had not yet appeared. Now and then, hearing footsteps, Kouka would shrink into the darkest corner of the doorway; the steps would sound louder and louder on the wooden sidewalk, some one would pass, and the steps would gradually fade from his hearing. All this had a curious effect on Kouka’s mind. In some doubt at first, the waiting, the watching with one object in view, more and more convinced him that he was right, and in time the idea that Archie was the murderer he sought became definitely fixed. The little house across the street gradually, through the slowly moving hours, took on an aspect that confirmed Kouka’s theory; it seemed to be waiting for Archie’s coming as expectantly as the detective. During the first hour of his vigil, a shaft of yellow light had streamed out of the kitchen window into the side yard, and Kouka watched this light intently. Finally, at nine o’clock, it was suddenly drawn in, as it were, and the house became dark. After this, the house seemed to enshroud itself with some mysterious tragic apprehension; and Kouka waited, stolidly, patiently, possessed by his theory. And then, it must have been after ten o’clock, Kouka, who had heard no footsteps and no sound whatever, suddenly, across the street, saw two figures. They stopped, opened the low gate, stepped on to the stoop and knocked. Their summons was answered almost immediately; the door opened, and, in the light that suddenly filled the door-frame, Kouka recognized Archie Koerner; a woman, his mother, doubtless, stood just inside; he heard her give a little cry, then Archie put out his arms and bent toward her; then he went in, his companion following, and the door was closed. In another moment the shaft of light shot out into the side yard again. Kouka was exultant, happy; he experienced an intense satisfaction; already he realized something of the distinction that would be his the next morning, when the little world he knew would hail him as the man who, all alone, had brought the murderers of that poor old Flanagan woman to the vengeance of the people’s law.