When Angelino Jack Robinson gets a new job in Australia, he decides to take his wife Ann, sons Shane and Todd and daughter Elisabeth `Lizzy` by sailing yacht from Hong Kong to Syndney. The gun he gets thrown in by Sheldon Blake proves disabled, and for a sinister reason: near Borneo, Blake`s men turn up to capture them. The family escapes but loses the yacht on a reef. They build a cool camp on an island. But the pirates keep coming back, and the boys discover why: he hid a treasure in the yacht. Shane is also discovered and captured in more than one way by French plane wreck survivor Françoise, who later teams up with the family.