: Teenagers Lina Mayfleet and Doon Harrow find the long-lost instructions and must solve the clues to lead their people to the surface. simonprior.com Key Cast and Characters Saoirse Ronan as Lina Mayfleet : A fleet-footed messenger who discovers the ancient box. Harry Treadaway as Doon Harrow
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Most critics agree that the film is "an enjoyable film with a nice simple to follow story" and works well for family viewing. It's particularly suitable for children aged 8 and up who enjoy adventure and mystery elements.
Two teenagers, Lina Mayfleet (Saoirse Ronan) and Doon Harrow (Harry Treadaway), discover an ancient message that might hold the secret to escaping the city.