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.

When two men are wrongly convicted of murder, a forensic blood spatter analyst helps to prove their innocence. And an expert witness uses mobile phone analysis to help police bring a gang of drug traffickers to justice.