Following a court appearance for drunk driving，Leo is required to perform unpaid work as a punishment，assisting AJ，a community worker on a run-down，largely black-occupied housing estate IN South London. AJ is hoping to divert boys away from crime by encouraging them to do sports，and，though initially dismissive of Leo as a white intruder，comes to respect him after he has saved the life of Errol，a former gang member now anxious to keep his little brother Levi out of trouble. Errol has been stabbed IN the leg by members of a gang from a rival estate and Leo stops him from bleeding to death. Earlier IN the week a young girl called Shana Block was stabbed to death at a funfair and her murder recorded on a mobile phone. As Shana lived onthe estate police sergeant Wallace involves Leo as a go-between with the suspicious residents. Also on the scene are Harry and Nikki，the latter dating Ryan，a young Scottish paramedic she met when called to the scene of Shana's death.