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Summary: An epic race for survival that follows four children and their dog through the treacherous waterways, dense forests and deep, dark wilderness. Cara and her siblings live on a canal boat in Wales. One day, as they are fishing with magnets in a drained canal lock, trying to clean it up, they pull out a mysterious locked safe. That night, a group of criminals come after the safe. The children flee, travelling with the boat as far as the canal goes before continuing into the forest on foot. Will Cara and her siblings be able to survive in the mountains with no parents, pursuers hot on their tail, and nothing but their wits, their bravery and one very large dog to help?