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198 leave of absence—I'm going to make a thorough search for him."

"And I'll be with you; don't forget that!"

There was not time for too much talk of a personal nature, as Tom and Jack had to give their attention to the great plane. The motors were working to perfection, and with luck they should, within a few hours, be over the great German works, which they hoped to blow up.

Tom was in charge of the plane, but he had Jack and others to help him, and there was a certain freedom of movement permitted, not possible in even the big photographing or bombing planes.

Down below little could be seen, for they were now over the French and German trenches, and neither side was showing lights for fear of attracting the fire of the other.

But Tom and Jack had been coached in the course they were to take and, in addition, they had a pilot who, a few weeks before, had made a partially successful raid in the region beyond the Rhine, barely escaping with his life.

And so they flew on under the silent stars, that looked like the small navigating lights on other aeroplanes. But, as far as the raiders knew, they were the only ones aloft in that particular region just then. They had risen to a good height to avoid possible danger from