An island-sea-and-wave adventure for boys and girls In summer, it can get pretty hot on the highest roof of a big city. Too hot for the stork Sudolf, who lives there together with his frog friends. Without further ado, he decides to fly north to cool off. That sounds like an adventure, but of course the frog children Flitzi, Fauli and Küken want to be part of it! But then Flitzi and Fauli flop off the stork back during the flight and land on a small island in the middle of the North Sea. How are they supposed to get home now?