Underwater Adventures with Louis and Louise follows a brother-and-sister lake trout duo as they receive life lessons from Grandpa Mack, spend a special night around the cedar stump, attend a birthday party, narrowly escape being eaten, and swim through the magic box. Along the way, they learn about the importance of respecting other fish, habitat loss, and the ecological health of the Great Lakes. Their kind, adventurous spirit provides a moral compass for all species.