When a dismembered body is discovered, police turn to a facial reconstruction expert to help identify the victim. And when a man is murdered in Northern Ireland, a cell site expert uses his tracking skills to help catch the killers.

When a 21-year-old student is murdered and dumped in the Humber Estuary, a forensic biologist helps police bring her killer to justice. And an expert witness analyses soil at a shallow grave to unearth the truth behind the death of a man in Scotland.