"Go and take another look," said Matt, anxiously. "See what they're doing."
The girl glided to the doorway again.
"The other air-ship is moving off," the girl reported, with a measure of relief in her voice, as she came back. "I think the bullets must have injured the propeller, or some of the machinery, for the air-ship is moving very slowly and seems to be in trouble."
"Did you see how many were aboard?"
"There were three in the car—one of them was Jerrold, and he was managing the motor."
"The other two," asked Matt, eagerly, "do you know who they were?"
"One of them was in uniform, and looked like a policeman. The other was short and thick-set and looked like a German."
"Carl!" exclaimed Matt, jubilantly. "Good old Carl! How did he ever find out where I was, I wonder?"
"I'll bet dad is trying to guess the same thing," said the girl. "He'll be badly cut up over this. But it's no more than he ought to expect," she added. "Whenever a man breaks the law he'll have to pay for it, sooner or later."
"What has your father been doing?" asked Matt.