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A look at how some of the UK's most serious and complex cases were solved by the expertise of a band of unsung heroes, the expert witnesses.
The murderer of Sarah Payne is linked to the crime by a forensic pollen expert.
A 3D-scanning expert uncovers crucial evidence to convict a twisted killer.
When a body is found in a wheelie bin, an expert tracks the suspects’ mobile phones.
Police turn to a forensic linguist to crack the code of a gang using a secret language.
Untying the knot in a dressing gown cord used to murder a woman finally nails her killer.
An intelligence analyst tracks the killers of a man stabbed to death in his own home.
The Boy in the Woods - The Murder of Rikki Neave. A soil expert's evidence helps to convict a killer 30 years after the murder.
After fire crews find a body in a burning flat, a blood spatter analyst finds evidence.
When a teen is fatally stabbed, an expert analyses the wounds to shed light on the attack.
An image analyst helps detectives unmask the killer of a young girl in Liverpool.
A mother and son vanish in 1976. Forty years on, a blood analyst helps to find the killer.
Rachel Nickell’s murder was unsolved until DNA technology finally identified her killer.
A boy's killer escapes detection. Thirty years on, a pollen expert finds crucial evidence.
When a disabled woman is killed, her neighbour is suspected.
A murder in Glasgow goes cold. Seventeen years on, a soil expert helps convict the killer.