The nets were set off shore about half a mile above the scout camp, and it was plain that something unusual was happening there. By the time the boys had reached the rough little dock opposite there were no “geysers” spouting, or other signs of strenuous activity. But the three fishing boats were clustered in a bunch, their occupants bending over the sides busy attaching tackle to something in the water which was invisible even through the glass. Presently the engines started, the boats separated, and headed for the dock.