When an apparent drug-related murder leads Operation Trident onto Sun Hill's patch, they suspect Yardie street gangs could be active in the area. A new scheme by Conway to encourage taxi drivers to help the police bears fruit when an overzealous cabbie brings a 'prisoner', Wesley Carter, to the station, saying he heard him making a drug deal. When Carter is linked to gangster Leroy Jones, Trident get Rickman to go undercover. As they reunite, Jones admits there are Yardies operating on the patch and he is trying to take on their drug running operation - but that a rival firm is trying to stop him - leaving Rickman caught in the crossfire of a drive-by shooting.