Micky thinks life's rotten: he's the youngest in the family and can't do anything right. His older brother calls him a miserable little worm; his sister says he should carry a health warning; and now he has to wear beastly glasses.
When the family go to live on an island surrounded by sun and blue seas, Micky is certain everything will be different. But it's just the same; he's still the youngest, he still can't do anything, and his brother still thinks he's a miserable little worm. Fed up, Micky decides to run away.
Fortunately, help is at hand when an old fisherman offers to teach Micky to swim. Although, there's something rather curious about this particular fisherman…He wears a seaweed shawl and his boat appears to have legs.