Overview: What begins as a routine call to a house fire becomes the biggest murder investigation in Welsh history.
Overview: The police must figure out how to investigate not one, but three of their own when it emerges the prime suspect is a police officer.
Overview: A new suspect emerges and with his chequered past, the police are convinced they've got their man. But the community isn't so sure.
Overview: Builder David Morris is convicted of the murders. After he's spent 20 years behind bars, a new witness comes forward, sparking a case review.