North (Kate Buffery) has transferred to the Vice Squad where a routine call to appease persistent complainer Stephen Warrington (Richard E.Grant) spirals into something far more sinister. As Warrington's behaviour becomes increasingly obsessive, North suspects there is more to him than meets the eye. Meanwhile, Walker and North have moved in together, and they struggled to strengthen their fledgling romance while working flat out on their separate cases. When Stephen Warrington becomes a suspect in the murder case, their paths cross at work as well as at home.North (Kate Buffery) has transferred to the Vice Squad where a routine call to appease persistent complainer Stephen Warrington (Richard E.Grant) spirals into something far more sinister. As Warrington's behaviour becomes increasingly obsessive, North suspects there is more to him than meets the eye. Meanwhile, Walker and North have moved in together, and they struggled to strengthen their fledgling romance while working flat out on their separate cases. When Stephen Warrington becomes a suspect in the murder case, their paths cross at work as well as at home.