The Sampson, a very large sloop-rigged boat, was standing up the creek, under full sail.

These were the "police boats," and they were taking their stations.
"I wonder where the Sampson is going," said Harry.
"She's going to take her station in Duck's Creek," said Ben.
Upon hearing this, Harry's expectations fell again.
"It's no use," he exclaimed.

"Charley Sheldon knows too much for us." "Not a bit," said Frank.

"This arrangement is only for to-night.

When we get up in the morning, we shall find the boats all out in the river." This immediately reassured Harry; and, after watching the Sampson until she disappeared in Duck's Creek, he led the way to the house.
After supper, as soon as it began to grow dark, they proceeded to put their plans into execution; but, before they started, Frank said, "Now, boys, we must watch and see how the trick takes, for I know that there are spies now around that boat-house.