"Those boys must be wonders."
"I'm afraid they are. That's why we've got to be careful of them. But I've got a plan to fix them, the whole lot of them."
"What is it?"
"I'll tell you as we go along."
As the car rolled past the group of aëroplanes with Jake faithfully standing guard over them, Kelly hailed him in a suave voice.
"Any idea where the young folks have gone?"
Jake, who had no idea that Kelly had a sinister motive in asking the question, replied readily enough.
"Yes, they've gone into Millbrook to get another spark plug. Something happened to one of the plugs of that red machine yonder."
"All right. Thanks."
Kelly drove on.