Mr. Swift stood staring at him, and so did Tom. Then the inventor asked: "Do you know that man? What about him, Tom? Why did he leave so hurriedly?" "I don't know his name," replied Tom, "but I am suspicious regarding him, and I think he left because he suddenly recognized me." Thereupon he told his father of seeing the man in the post-office, and hearing the talk of the same individual and two companions in the restaurant. "And so you think they are up to some mischief, Tom?" asked the parent when the son had finished. "Well, I wouldn't go quite as far as that, but I think they are interested in your patents, and you ought to know whether you want them to be, or not." "I most certainly do not--especially in the turbine motor. That is my latest invention, and, I think, will prove very valuable. But, though I have not mentioned it before, I expect to have trouble with it. Soon after I perfected it, with the exception of some minor details, I received word from a syndicate of rich men that I was infringing on a motor, the patent of which they controlled." "This surprised me for two reasons. One was because I did not know that any one knew I had invented the motor. I had kept the matter secret, and I am at a loss to know how it leaked out. To prevent any further information concerning my plans becoming public, I sent you to Mansburg to-day. But it seems that the precaution was of little avail. Another matter of surprise was the information that I was infringing on the patent of some one else. I had a very careful examination made, and I found that the syndicate of rich men was wrong. I was not infringing. In fact, though the motor they have is somewhat like mine, there is one big difference--theirs does not work, while mine does. Their patents are worthless." "Then what do you think is their object?" "I think they want to get control of my invention of the turbine motor, Tom. That is what has been worrying me lately. I know these men to be unscrupulous, and, with plenty of money, they may make trouble for me." "But can't you fight them in the courts?" "Yes, I could do that. It is not as if I was a poor man, but I do not like lawsuits. I want to live quietly and invent things. I dislike litigation. However, if they force it on me I will fight!" exclaimed Mr. Swift determinedly. "Do you think this man was one of the crowd of financiers?" asked Tom. "It would be hard to say. I did not like his actions, and the fact that he sneaked in here, as if he was trying to get possession of some of my models or plans, makes it suspicious." "It certainly does," agreed Tom. "Now, if we only knew his name we could--" He suddenly paused in his remark and sprang forward. He picked up an envelope that had dropped where the stranger had been standing. "The man lost this from his pocket, dad," said Tom eagerly. "It's a telegram. Shall we look at it?" "I think we will be justified in protecting ourselves. Is the envelope open?" "Yes."