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When Angelino Jack Robinson gets a new job in Australia, he decides to take his sissy wife Ann, brave sons Shane and Todd and wining 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 then one way by French plane wreck survivor Françoise, who later teams up with the family.