"There's Bart!" cried Fenn. "Come on in!"

Anxious to tell his chums the news he had heard, but not wanting to
awaken the suspicions of the Upside Down Club members, Bart prepared and
went in swimming. He managed to get close to his three friends in turn,
and quietly told them to go out, dress, and wait for him near the boat,
which he told them was tied close at hand.

"Go out one at a time," Bart cautioned, "or they may suspect something."

In a little while the four boys were seated in their boat and were rowing
down stream.

"Now what's up?" demanded Ned. "I declare you're as mysterious as though
something had happened."

"Something's going to happen," said Bart.

"What?"

"The Upside Downs are going to spoil our dinner--if they can!"

"How did you hear of it?"

"Who told you?"

"What are they going to do?"

The three chums asked these questions of Bart all at once.