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 a London housing estate. With equal fascination for the local gang - the Dell Farm Crew - and the pigeon who visits his balcony, Harri absorbs the strange elements of life in England: watching, listening, and learning the tricks of inner-city survival. But when a boy is knifed to death on the high street and a police appeal draws only silence, Harri decides to start a murder investigation of his own, unwittingly endangering the fragile web his mother has spun around her family to keep them safe.