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was a disheartening discovery, but the three Rover boys did not stop to think it over. Throwing open the bolted door, Tom and Dick joined Sam, and in the darkness made their way to the rear of the room in which they had held Cuffer and Shelley prisoners. In a minute more they were outside, under the trees at the rear of the old mill.

"Which way did they go?"

Tom asked the question, but nobody could answer it. The moon had now gone under some clouds and it was so dark they could scarcely see ten feet in any direction.

"Perhaps they took to the river again," suggested Sam.

"It is not likely," answered his big brother. "But we can take a look."

They ran around to where the men had landed. Their boat was still in its place, tied to a tree.