"You are certain about this houseboat trip?"
"I am."
"And who is going?"
"The three Rover boys and some of their school chums."
"Humph! I'd like to get square with the whole crowd!" muttered Lew
Flapp. "I'd like to sink them in the middle of the Ohio River!"
"We'll square up, don't you worry," answered Dan Baxter. "I'm not forgetting all they've done against me in the past. If I had the chance I'd wring the neck of every one of them," he added, fiercely.
"I don't think it is safe to stay around here any longer," said Lew
Flapp, after a pause. "Somebody may spot us both."
"I'm not going to stay any longer. We can get out on the night train.
By the way, supposing Sam Rover doesn't get out of the river."
"What do you mean?" questioned Flapp, with a shiver, although he knew well enough.
"Maybe Sam Rover was drowned."