Deep WaterNovember 12, 2016

As Nick prepares to face the Critical Incident Investigation Team, another body is discovered with the same hallmarks, confirming that the dating app THRUSTR is being used to lure victims. With evidence that former football legend Christopher Toohey has links to the past crimes, Nick and Tori go to extraordinary lengths to persuade him to talk... with tragic consequences.

Deep Water was broadcast on BBC4 at Saturday 6 January 2018, 01:42. This episode was initially placed on Sunday 13 November 2016.