It is seldom that any one goes there." "Where's that farmhouse we saw yesterday ?" questioned Sam.
"On the other side of the lake, about half way down," answered Gordon.
"There is a pier there so we can land." Of course all of this the Meadow-Brook Girls did not hear.

But, having reached the houseboat, they made their way down the inlet, and were near the mouth of it when they sighted the motor boat on that side of the island.

The girls saw it head straight for the pier where Harriet had landed the previous evening on her way to the farmhouse for supplies.
The boys tied up the boat and two of them got out and went up the slope toward the farmhouse.
The two boys, George and Billy, returned to the motor boat walking rapidly.
"Did you find out anything ?" called Sam.
"Yes." "Anything wrong ?" asked Larry.
"I don't know.

It's a puzzle," replied Captain Baker.

"Two of them were up at that farmhouse last night.