“I presume it will all be explained before many hours,” Jimmie answered. “What I’m most interested in now is this race. Suppose Ben catches the Louise. How’s he going to get the machine down without shooting the aviator? And that wouldn’t be good for the machine!”

“He’s got some scheme on foot,” Carl answered. “Just watch him whirl around the Louise. There! Now, don’t you see he’s got the other aviator buffaloed? I’ll bet he’s holding a gun on him!”

The two machines came back side by side. The Ann landed on the ledge and the two boys were hustled into the seat by the side of their chum who sat grinning at their bewildered faces.

Before they could ask any questions the Ann shot away and in an incredibly short space of time Jimmie and Carl were landed by their own fire!

“Get a move on, now!” Ben cried, as he again sprang into the seat of the aeroplane. “Mr. Havens will be wanting breakfast, and I’ve got a date with Dick Sherman!”

The boys stood watching the Ann lift into the air and make toward the summit. Their faces expressed both wonder and impatience.

“Now, what do you think of that?” demanded Jimmie.

“This is one of the mysteries you read about in books but never see in real life!” laughed Carl. “I wish we’d choked the story out of Ben. He’s laughing in his sleeve this minute, I know he is!”

“Boys!” Mr. Havens called from the tent.

Jimmie and Carl hastened forward and looked in.