This BBC and Sundance Channel co-production gets spookier by the week, and tonight is no exception. There's a particularly violent incident which results in Robin being given her marching orders, and the police choose to wind down their investigation as they presume young Tui is a lost cause. However, there's nothing that will stop the detective, and as she continues the investigation on her own, she discovers a wee bit of evidence that suggests the missing girl is still very much alive.