The film tells the story of Ben and his little sister Saoirse – the last Seal-child – who embark on a fantastic journey across a fading world of ancient legend and magic in an attempt to return to their home by the sea.
Ben and Saoirse live in a lighthouse by the sea with their father, who remains distraught over the loss of his wife several years earlier. Though Ben is aware of the responsibility that comes with being a big brother, he is easily frustrated with Saoirse, who, at six years old, has yet to utter a single word. When Saoirse discovers a shell flute that used to belong to their mother, the spellbinding music she creates becomes both a means of communication and the key to a magical secret locked deep in their mother’s past. After they are sent to live with their granny in the city, Saoirse and Ben must work together to find their way home. Ben soon realizes that his sister holds the power to bring the ancient stories their mother told them to life — but in order to keep these tales alive, she needs to find her voice, and he needs to overcome his deepest fears.
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