Three children are spending their summer on a wild Scottish island. Fraser is desperate for adventure; Hayley is fed up she's even there; while Dunny spends his days staring out to sea. He hasn't said a word in years.

But everything changes with the discovery of two bodies on the beach: a whale and a man. Fraser and Hayley see a mystery-adventure to be solved, but Dunny is inconsolable. And in the end, it will take someone who listens to the sea to put it right.