'There's going to be a storm,' Father told Fritz. 'Find your brothers and bring them to our room.' A Swiss family are going to Australia when their ship sinks in a storm. After that, Mother, Father, Fritz, Hans, Ernst, and little Franz must make their home on a Pacific Island. Like Robinson Crusoe, they have many exciting times on the island, and they learn a lot about its animals and plants. But do they always want to stay there, or are they going to leave one day?