As Dennis and Billy guide an expert hunter on a trip into the bush, the man's son keeps trying to sabotage the hunter's efforts.

Dougal's tug is hired by two men posing as divers searching for a Great Lakes wreck but who are really after stolen jewelry cached on the lake bottom by the thieves after a Montreal robbery.

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.