Hunter and Perkins investigate when an off-licence owner is held at gunpoint by two armed robbers wielding a machine gun. When one of the robbers is identified as a local lout with previous, Perkins ropes in De Costa to try and gather information from the man's less-than-helpful girlfriend. With some gentle persuasion, however, the girl agrees to talk and provides the vital evidence against her boyfriend's accomplice. Meanwhile, Ackland is in court giving evidence in the case of a young woman who has accused her ex-husband of rape. However, Ackland is worried when the defendant tries contacting his former lover in an attempt to stop her from giving evidence against him in court.