On his eleventh birthday, schoolboy Magnus Fin found out that he is half selkie -- part human, part seal. Although he looks like a boy and lives on land, he can breathe underwater.
When a rusty metal chest is flung ashore in a storm, Magnus Fin decides to investigate. But he injures his hand on the strange box, and his sealskin starts to show through. His teacher realizes that there's something very unusual about Magnus Fin -- and rumors start to spread.
Deep in the ocean, the great sea god Neptune has problems of his own. The treasures of wisdom have been stolen, and his memory and powers are fading fast. Could his missing treasure be inside the chest that's been washed ashore? Magnus Fin is the only one who can find out and restore order under the sea.
But now there is a young journalist investigating the rumours about 'fish people'. Can Magnus Fin complete his mission before the selkie secret is revealed and his selkie family are forced to leave the bay forever?
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