One day, Uncle Melker decides to organize a whole play day for all the children. The excursion goes to Dead Bay, where two teams, the Sharks and the Hökarna, each form their own band of pirates. But when two bands of pirates are in love with each other, they must have something to fight over, the famous Mysak diamond.In connection with television and film recordings about the children at Saltkråkan, a number of still images were taken which were put together for the book Skrållan och sjörövarna.