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Newly orphaned Jake is determined to escape from his Home Academy and to find a new home with his dog, Jet. He thinks his biggest challenge is going to be getting out and over the wall but, when he does, he finds this is the least of his worries. The governing 'Coalition' is able to track everyone in the country via the 'hub chip' in their neck and in no time 'the hubbers' (police) are on his trail. All seems lost until Jake stumbles into a gang of ''outwalker'' kids. After proving his worth, he is permitted to join their gang and together they set out on a perilous journey north towards the heavily guarded border with Scotland.