Some strange things happen to the Robinson family on their holiday on the Fijian island of Tavioka. At first it's just small things that go wrong — someone steals their shoes, and they find their rooms full of toads! But then they start to feel their lives are in danger. It becomes clear that someone doesn't want them to stay on the island. But who? And why? Their Fijian friend Iveri helps them to find out.