Part 1 of 2. When an East End father and son are killed in a road accident, Nikki and Jack find themselves working alongside a police officer with a vendetta. Clarissa summons her husband Max, a digital forensics expert, to help crack the case and he uncovers disturbing video evidence.
Part 2 of 2. Having found a link between the two cases, the team struggles to make sense of it. Nikki visits a disgraced former colleague who may hold the key. Thomas uncovers the bizarre truth about how Tina died.