This series begins in 1976, with the memories of Nigel Rossiter, the postman who saw things he wished he hadn't seen. He was still learning the ropes, as a postman in the rural Pembrokeshire village of Llangolman. But that December day would change pretty much everything around here.

We hear how the events of the next hours, days and weeks, would leave a community first in fear, and then in disbelief, as they learned the identity of the victims, and began to wonder who could be responsible.

As the ripples of the crime, and the investigation start to spread - can anyone make sense of what's happened? Are there clues which could make anything clearer?

This is the first episode of a six-part series which examines this case, exploring if justice was ever served, and telling the story of a community who won't let the case fade away.

Narrated by Bettrys Jones

Produced by What's The Story Sounds