"When are you going to start spy-hunting?" he asked.
Chester looked at Hal.
"What do you think?" he inquired.
"Well, I should say not until to-night," replied Hal. "I don't believe we could do much good in the day time."
"My idea exactly," agreed Chester. "We may have to make a few preparations."
"I would like to go with you boys," said Major Derevaux, "but I fear it will be impossible. I must return immediately I have had my interview with General Ferrari."
Uncle John had been sitting silent during all this conversation, but now he straightened in his chair and brought his fist down on the table with a bang.
"By Jove!" he exclaimed. "All this talk makes me feel young again. What's the matter with my joining this expedition?"
The two lads gazed at him in wonder. Uncle John saw the amazement written on their features.
"I mean it," he continued. "I want a hand in this game myself. Here, waiter, check!" he called.