"Oh, yes you have," and the major smiled.
"I have? Where?"
"On the train, coming into Paris."
"You mean the German spy?" cried Jack.
"The same," answered the Frenchman. "That's just what he is, and he is spying on you. Now, in view of what is going to happen, we don't want that to go on. So I have come to ask you to change your lodgings, and I think I can take you to one that will be most agreeable to you both."
"But what does all this mean?" asked Tom. "Is there——"
"There is 'something doing' as you say so picturesquely in the United States," interrupted the major. "I have come to tell you that you are to undertake a most perilous mission!"