Billy and Pete bypass the police and conduct their own investigation into a case of vandalism of the Williams' lodge, which leads to a dangerous midnight confrontation.

Those two intrepid fishermen, Billy and Pete, hike into the mountains to visit their secret fishing place - a jewel-like lake filled with fine pike. To their amazement, they find that the fish are dying and it appears that bush pilot Dennis Mogubgub has something to do with it. Horrified, the boys try to trap and remove the fish to another lake before it's too late to save them. That's when they learn a lesson in conservation.

Dougal MacGregor's aging tugboat goes on the blink. As he and Billy leave the boat to buy some new parts, a sailor from an Iron Curtain ship deserts and steals the ailing tug.