Hunter receives an anonymous phone call which claims that the three murders which he recently investigated are linked. Having already made the connection between Neaman and Trent, he soon realises that the death of a young estate agent which he and Nixon investigated several weeks ago may not have been suicide as they first thought – and that the victim could be the third body related to the killer. Morrell is called in to lead up the investigation. Meanwhile, Powell decides to drown his sorrows after temporarily splitting from his civil partner Mark, unaware that he is in sight of the killer. When Hunter receives Powell's warrant card in the post, he realises that he could be the next victim.