Newly arrived from Ghana with his mother and older sister, eleven-year-old Harrison Opoku lives on the ninth floor of a block of flats on an inner-city housing estate.
The second best runner in the whole of Year 7, Harri races through his new life in his personalised trainers - the Adidas stripes drawn on with marker pen - blissfully unaware of the very real threat all around him.
But when a boy is knifed to death on the high street and a police appeal for witnesses draws only silence, Harri decides to start a murder investigation of his own. In doing so, he unwittingly endangers the fragile web his mother has spun around her family to try and keep them safe.
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