this puzzles me," he continued, turning to his friends.
"Each boy was alone in a boat?" queried Dave.
"Yes."
"And Plum was following Hamilton?"
"He seemed to be. Anyway, his boat was behind the other."
"Was anybody else around?" asked Phil.
"I didn't see a soul, and the river was almost as bright as day."
"Did you see them a second time?" asked Dave.
"No, for I was getting ready to go home when they came along. I don't know where they went, or when they got back."
Ike Rasmer could tell no more than this, and as it was getting late the three boys lost no time in shoving off once more and pulling for the Hall boathouse.
"This stumps me," declared the senator's son. "What do you make of it? Do you think Shadow and Plum are up to something between them?"
"No, I don't," answered Dave, decidedly. "Shadow is not the fellow to train with Gus Plum. He doesn't like the bully any more than we do."
"No wonder Shadow feels sleepy, if he spends his nights on the river," said Phil. "But I can't make out what he is up to, I must confess. If it was some fun, he would surely take somebody with him."
