"I hope he runs into a tree, or a rock, or something."
"There he goes, along the other shore of the lake," said Nan, a few seconds later. "See, I think he is trying to scare the folks in that other motor boat."
"He's either crazy or a fool," murmured Walter.
The unknown motorist was evidently amusing himself at the expense of those less daring than himself, and he raced up and down the lake several times. But soon a larger motor boat put out and bore down upon him.
"We've been laying for you," said a man who was evidently an official. "You'll not try any more of those tricks."
"That's right—place him under arrest," said another man, one who had come close to suffering a collision. "I'll make a charge against him."
"I was only having a little fun," whined the man who had been racing around.
"You can tell your story at the police station," was the answer. And then the fellow was placed under arrest.
Nan and Walter continued their ride in the moonlight, and soon the unpleasant incident was forgotten. They talked of their good times at Palm Beach, and then the youth referred to what Nan proposed to do for Mrs. Bragley.