A gang of masked girls armed with baseball bats run riot at a wedding, but escape with the presents before PC Taviner and PC Hollis can catch them. The gang have been causing headaches for Sun Hill for weeks, and although she is not involved in the case, Supt. Chandler sends DC Kate Spears to visit the local schools, ostensibly to encourage students to join the Met's Volunteer Cadet Corps, but secretly to obtain information on the gang and its members. The gang's violence intensifies and the bride's sister, Debbie Pike, is found badly beaten after an altercation with a mother and her baby on the high street. As rumours about her and Supt. Chandler fly around the station, Kate Spears pushes an eager schoolboy informant too far, and he too is found bashed. When he regains consciousness, he tells Spears that Debbie is a gang member. Debbie admits she arranged for the gang to attack the wedding as she was in love with the groom, and Spears finds herself in grave danger when she confronts t

As actor Mark Wingett prepares to leave the programme, he reflects on his character Jim Carver's 21 years at Sun Hill, from naive probation bobby to DC and all that came in between - drinking, gambling, marrying and divorcing Marie and finally landing the woman of his dreams - June Ackland.