Dot is all set to spend the day on the lake fishing with her dad. They've got fishing rods, bait, and lots of sandwiches. And since Dad always comes home from his fishing trips empty-handed, Dot has figured out the perfect high-tech way to make this the most successful trip ever: the Fisherman Joe Fish-Finder! All she has to do is put this amazing frog gadget in the water and open up the app on her tablet, and she and Dad can use sonar to detect all the fish in the lake. But Dot and Dad get a little more than they bargained for when the gadget gets eaten by a giant fish that is bent on traveling with it. Can Dad's old-school fishing expertise help save the day?