On the beach is a roll of paper. Plummy finds it first and discovers that it is a treasure map. He quickly starts trying to find the hidden treasure chest. Plif and Plops try to get hold of the map but to no avail. After an exciting underwater operation, Plummy drags the treasure chest on to dry land. However, he discovers that he cannot open the chest without the help of his two friends. All together they open the chest and enjoy the fact that they have found some fine royal treasure.