From Darkness - Season 1 Episode 4

Claire tells Hind that her suspect has been calling her and threatening to kill more victims if the original murderer is not apprehended and believes that they need help. Hind disagrees but is suspended following complaints by the Hardings so he tries a little sleuthing of his own, helped by young sergeant Boyce, establishing a context for the original slayings. However Claire discovers that two killers may have been at work, one in the late 90s and now one in the present. With what she knows will she be in time to save another potential victim?