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two Rover brothers looked at each other in amazement, and for a moment neither spoke.

"What do you suppose he meant?" asked Sam, presently.

"He meant just what he said," returned Tom. "I'm going to tell Dick," and he summoned his big brother without delay.

"I think I can piece this together," said Dick. "I saw Bob Grimes talking to Dudd Flockley this afternoon, and again after supper. Most likely Bob got on the trail of something Dudd thinks of doing. He doesn't want to appear as a tattle-tale and at the same time he doesn't want to see our machine ruined. So that's why he warned you in such a queer fashion."

"You must be right," answered Tom. "What shall we do?"

"Nothing, Tom."