Innocent passers-by are left shocked when a city centre pub erupts into knife-wielding violence. It's the latest outbreak of violence between gangs engaged in a brutal turf war to control the sale of drugs in the city. In this special 90-minute episode, detectives are tasked with bringing down the Norfolk-based Lewis drugs gang, and in particular the man at the top of it. After painstaking detective work, the police arrest their Suspect Number One, confronting him in the interview room. But will the evidence stand or fall?