Oh, how angry Elliott is! He has no desire to spend his holidays on the boring, silly Mouse Island. But mouse luck smiles upon him, and his friend Isabella will also go on vacation to the same island. Only the smile of luck quickly fades: the two friends run into Boky Bouka and his gang. And when the Ghost of the Lighthouse appears, the situation becomes very difficult. Fortunately, they will have the help of Fite Flounder and the penguin Raketa. And they will succeed. Because with courage, humor, and friendship, anything is possible.