Followingacourtappearancefordrunkdriving,Leoisrequiredtoperformunpaidworkasapunishment,assistingAJ,acommunityworkeronarun-down,largelyblack-occupiedhousingestateinSouthLondon.AJishopingtodivertboysawayfromcrimebyencouragingthemtodosports,and,thoughinitiallydismissiveofLeoasawhiteintruder,comestorespecthimafterhehassavedthelifeofErrol,aformergangmembernowanxioustokeephislittlebrotherLevioutoftrouble.ErrolhasbeenstabbedinthelegbymembersofagangfromarivalestateandLeostopshimfrombleedingtodeath.EarlierintheweekayounggirlcalledShanaBlockwasstabbedtodeathatafunfairandhermurderrecordedonamobilephone.AsShanalivedontheestatepolicesergeantWallaceinvolvesLeoasago-betweenwiththesuspiciousresidents.AlsoonthesceneareHarryandNikki,thelatterdatingRyan,ayoungScottishparamedicshemetwhencalledtothesceneofShana'sdeath....