“There’s something up,” he said to his assistant. “I have no idea what it is, but I want you to shadow this man and see what becomes of him.” “Do you think he’s a crook?” asked the young man. “Not yet. He may be. If so, it won’t be the first time that a crook has tried to throw me off the track by calling on me. I simply feel that there’s something queer in this, and I’d like to find out about it. So I shall ask this man to call again unless he makes up his mind to tell me all the facts.” Snell refused to tell all the facts, and so Patsy slipped out after him. He had not gone far from the house when the young detective became convinced that another man also was following Snell. This made his work very difficult, for he had to look sharp against betraying himself not only to Snell, but the other man. Snell went into a drug store and bought a cigar. The man who seemed to be following him loafed on the opposite corner. Patsy turned down a street, and dropped into a doorway, where he made a swift change in his appearance. He was at Snell’s heels again when the man from Wenonah went on. The other man seemed to have disappeared. “I was mistaken,” thought Patsy, “or the second chap is a better shadow than I am.” For some blocks he kept up his chase, never losing sight of Snell, and seeing nothing more of the other. Meantime Snell was apparently wandering around aimlessly. He would stop at a corner and wait a full minute before he made up his mind which way to go. Often he changed his direction. In this way he got into a neighborhood which was very quiet in the evening. Part way down a block he stopped suddenly, stood still for a moment and then went close to a building. He was then in such deep shadow that Patsy could not see him. “Somebody spoke to him,” reasoned the detective. He went cautiously closer, and before he could see anybody he heard the sounds of voices in conversation. What they said it was impossible to make out. The detective dared not get close enough than that for fear of attracting the attention of the men. There seemed to be two of them. Presently he heard one voice say: “I won’t do it.” One of the men started away. “It will be the worse for you, then,” growled the other. The first man hastened his steps. As he came from the shadow, Patsy saw that it was Snell. The other man was darting after him on tiptoe. He had one arm drawn back. “Great Scott!” thought Patsy, “he means murder!” He gave up trying to conceal his actions then. Running forward as fast as possible, he shouted: “Look out!” Snell turned quickly. The other man was close to him, and let his hand fall. With a great leap Patsy was up to him just in time to catch his arm. But it was too late to stop the blow entirely. A slungshot in the man’s hand slipped from it and struck Snell a glancing blow on the head. “Ah!” he cried, and staggered.