Again Grant rapped upon the glass, pounding on the window sash also in his efforts to arouse the attention of the man within.
All four boys now were keenly excited and all were eager to discover what the intruder would do, now that his presence had been discovered.
To their surprise the man did not respond to the summons. Even his position was unchanged and in the dim light the boys were unable to decide whether or not he had even glanced in the direction from which the hail had come.
"There's only one thing we can do," said George.
"What's that?" demanded Grant.
"Go around to the other side and tell Fred we've got to have the door unlocked. Then we'll make a rush on the fellow before he knows that we are after him."
The suggestion was quickly followed and soon the four boys were standing together in front of the side-door which opened upon the dock.
"Now, then," said Fred, who insisted upon retaining his key, "when I unlock the door all four of us must make a rush together."
"That's right," whispered George as he grasped more tightly the bat which he was holding in his hand.
"Let String and George go ahead. They are the best armed," said Grant.