Bart pondered what he should do. It was out of the question for him alone to attack these conspirators. They were too many for any single man. He must arouse his comrades at once.

With the utmost caution he tiptoed back, and finding the room, not without some difficulty, bent over the sleepers. They were dead with sleep and he had to shake them to get them wide awake, but the news he whispered to them had them on edge and ready for action in an instant.

They crowded together for a whispered conference.

"What would we better do?" asked Billy.

"There's just one thing to do," said Frank, "and that is to nab the whole bunch. That is," he went on, "if we find that they're really hatching mischief, as Bart thinks. I've picked up enough German in the last few months to be able to understand what they're talking about, and on a pinch I could even talk with them after we've got them under our guns."

"But are you sure we have any right to arrest them?" asked Bart, a little doubtfully.

"Sure we have," answered Frank promptly. "You said they were armed, didn't you?"

"Yes," replied Bart.

"That's all the excuse we need then to nip this thing in the bud," Frank answered. "It's against regulations for the Germans to carry arms in the zone occupied by the American army, and any one who does is liable to arrest on sight. See that your guns are all right, fellows, and come along. I have a hunch that we're going to give these plotters a surprise party. But we'll listen first and make sure before we pinch them."

Bart went in advance to show the way, and his comrades crept after him, drifting along like so many ghosts.