“‘SIMEON.’” “Then Darwin was with Rich that night?” “No doubt.” Carter folded the paper and placed it carefully away in his pocketbook. He looked upon this note as an important piece of evidence. The “he” mentioned in it, he felt confident, referred to the man who had been murdered at the Red Dragon Inn. According to this note, Rich and Darwin had dined together at the Knickerbocker Cottage. It would be an easy matter to find out what time they left that place. Another thing was clear, and that was that Darwin had taken fright about something, or he never would have removed his things from the flat in such haste. Was this move an indication of guilt? Carter turned to Dora, and asked: “Do you know where Rich and his sister reside?” “I do not,” Dora replied. “Did you ever hear Darwin speak of a woman named Isabella Porter?” “I know that woman.” “Where does she live?” “I do not know.” “Did you know that Darwin and Rich were acquainted with her?” “Rich has known her ever since she was a small girl.” “What about Darwin?” “He has only been acquainted with her a short time.” “When did you first meet her?” “She was in Rich’s company one night, and he introduced her to me.” “What do you know about her?” “She is the daughter of a rich merchant, I believe. Her mother and father are dead. She has an income.” “Is that all you know?” “It is.” It was too late to continue the inquiries further that night, he concluded, and he determined to go home, as long as he was uptown. Carter was in a very thoughtful mood. Many curious events had happened during the past twenty-four hours. He was walking along leisurely, with his head bowed, thinking of plans for that day, and where he would go to make inquiries, when his attention was attracted to two men, who were walking ahead of him. Instantly he raised his head and slackened his pace. One of the men he recognized as Darwin. The man’s companion he had never seen before. He could not get near enough to the men to hear their conversation. At the corner of Fifty-second Street, the men separated, and Darwin started in an easterly direction. Carter decided to follow him, and he gave up the idea of going home. Darwin reached the east side of town, and turned into Second Avenue. “What business has he over here?” the detective asked himself, as he kept on the trail of his quarry. Between Forty-first and Fortieth Streets Darwin halted under a street lamp. From his pocket he took a slip of paper, consulted it, and then went along examining the numbers of the houses. Carter stopped in the doorway of the corner store and watched him. At the same time he changed his disguise. He now looked as tough as any of the night prowlers in the questionable neighborhood. Darwin entered a tall tenement. Carter hurried out of his place of concealment. He also went into the house and stood in the lower hall.