"This," said Hal, "should be Spa, unless my geography and sense of direction are all wrong. I'll take a chance, at all events."

Almost above a score of the lights, Hal shut off the motor and the machine began to descend. A short time later it came quietly to earth just beyond the village. Hal scrambled out and spoke to the Germans.

"This should be Spa, according to my calculations," he said. "Correct me if I am wrong."

"You are right, sir," said one of the German delegates. "You have done well in bringing us here in such a short period of time."

The Germans alighted, and Chester also scrambled out.

"If you will come with us," said the spokesman of the enemy mission to the lads, "we will see that you are provided with quarters for the night. It is hardly possible that we will return before to-morrow at noon, if at all."

The lads followed the Germans into the town. Before a building somewhat larger than the rest, the men stopped and the one who appeared to be leader of the party said:

"You gentlemen wait here. I will go within and see that quarters are provided for the young Americans."

He motioned the lads to follow him, which they did. Inside a German officer barred their progress, but the German soon set the man's doubts at rest, and the latter stepped aside.

"Captain," said the German envoy, "these gentlemen have brought us back from the allied lines, and will conduct us there again to-morrow should it be necessary for us to go. You will kindly see that they have all necessary accommodations for the night."