DS Samantha Nixon drags a wounded DS Phil Hunter out of the line of fire of an enraged Dennis Weaver, and the two escape into an abandoned Tube tunnel. PC Yvonne Hemmingway is frustrated when police red tape prevents her from helping pregnant teenager Shirley who has been badly beaten. Hemmingway angrily confronts Supt Adam Okaro, and his reaction attracts the interest of DC Rob Thatcher. PC Gary Best tracks down Shirley's mother, and Hemmingway convinces her to testify against Stuart Rifkin. Realising DS Hunter and DS Nixon are missing, DI Neil Manson and DS Debbie McAllister try to track them down with the help of Phil's daughter Madison and his informant Stephen Fletcher. Barricaded in a storage room, a delerious Hunter admits to Nixon that he blackmailed and betrayed Nick Klein, but when Nixon tries to get help, Dennis Weaver attacks them. As Weaver and Nixon fight, Hunter manages to get hold of the gun, and he shoots Weaver, ending the ordeal. PC Gabriel Kent visits PC Kerry Young