When a young woman is found brutally murdered in a Cardiff flat on Valentine's Night 1988, local police arrest 5 local black men from the area despite no physical or DNA evidence linking any of them to the killing.
When the police interrogation tapes of Lynette's boyfriend Stephen Miller are played in court, the convictions of the 'Cardiff Three' are overturned. But it takes another 10 years for the case to be re-opened and the real killer to be identified.