When the Go Ahead boys drew near the dock they separated, George and Grant moving to one side of the boat-house while John and Fred approached from the opposite side. There were two large doors in the front of the boat-house, both of which now were closed. The upper part of each, however, was of glass and was so made that the boys were able to stand on the dock and by leaning forward could peer into the building.
"He's there," whispered George excitedly, after he had looked within. Quickly withdrawing, Grant took his place and silently peered into the slip. At the same time John and Fred were making their investigations on the opposite side of the slip, although Fred was having his difficulties because he was not tall enough to enable him to look through the glass.
The man whom George had discovered apparently had not moved from the place in which he had first been seen. Perhaps he too was listening and was fearful of an attack.
Their excitement now greatly intensified, George beckoned for John and Fred to come to the place where he and Grant were standing on the dock.
"He's there," whispered Fred.
"I told you he was," whispered George in reply. "Now the question is how shall we get him?"
"How did he get in?" inquired Grant.
"I don't know," replied George, shaking his head. "There isn't any window open and the doors are locked."
"He must have dived under the door and come up that way," suggested John.
"This isn't any time to be discussing how he got there," remarked George. "The thing for us to do is to find out how we are going to get him out or get him. Let's go around to the window on the river side."