Sun Hill efforts to protect the organisers of a community festival are in vain when the convoy is attacked. New PC Nick Klein is friends with the organiser, Anil Indrani, but the brother of Klein's girlfriend Pam is arrested by PC Dale Smith as he rushes to fight off the attackers. Paired with Smithy the next day, Klein manages to defuse a tense situation when Smith confronts a group of black youths at the market. That night, Indrani's club is raided by officers from Barton Street, led by DS Vickers. Klein is certain that Vickers team has planted drugs on the Billy the DJ, and begins to suspect they were also responsible for the attack on Indrani. PC Smith is in trouble: the youths at the market were undercover police officers conducting an 'integrity test' and Smithy's attitude to racial matters leaves a lot to be desired. As Klein lights up a joint at Pam's house, DS Vickers raids the place and threatens to arrest him for possession unless he helps him destroy Indrani.