DS McAllister continues to get useful tip offs from her informant and lover, Jamie Ross, including one about an armed raid on a betting shop. Meanwhile, there's a war brewing on Sun Hill turf between rival hot dog vendors, one of whom is DC Paul Riley's brother Joe. When Joe Riley's lockup is set on fire and several of his vendors attacked, PCs Hollis and Hayward and DC Riley go undercover as hot dog vendors to catch those responsible.