Joseph starts work uncovering the links between the recent murders, in the concluding part of this urban thriller starring Marc Warren.
A distraught Salma has implored him to believe her and take her back, and Joseph gives her the keys to his flat, although he is still unsure what to believe. Joseph's colleague, Mel, has a drink with prosecution lawyer Mark Moore, but spots him talking to another woman as she arrives; he insists it was to do with work.
On a run-down council estate, seven out of the nine occupants of a crack den are brutally slaughtered. Only a young mother and her baby are alive – and Mel recognises the mother as the woman Mark was talking to the night before.
When confronted, Mark admits that the woman is, in fact, Leah's errant sister, who insists that her father did not abuse Leah at all – so Mark was trying to keep it quiet.
Back at the office, a call comes in that Leah Wallace is missing – before anything can be done, a group of kids playing football find her body in an alleyway; her tongue has been removed and her chest split open beside a pile of sand.
Mel and Terry stumble across another link and the team descends on the car park – all of a sudden, it begins to make sense.
Joseph returns to his flat, and to Salma, feeling relieved to have cracked the case. As he enters, however, he notices sand underfoot and realises that the nightmare is far from over...
Marc Warren stars as DCI Joseph Walker, with Marsha Thomason as DS Mel Palmer and Daniel Ryan as DI Terry Hedges. Mark Moore is played by Niall Macgregor.
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