The Pembrokeshire Murders has proven phenomenally popular after just one episode, with a whopping 6.3 million viewers tuning in to watch the drama’s premiere on 11 January.

It is ITV’s biggest new drama since 2016. It boasts a star-studded cast (think Luke Evans, Alexandria Riley and Keith Evans, to name just a few). And it is – much like BBC One’s similarly popular The Serpent – based on a stranger-than-fiction true story.

What is the true story of The Pembrokeshire Murders?

In 1985, siblings Richard and Helen Thomas were discovered dead in their home at Scoveston Park in Pembrokeshire, Wales. Four years later, married couple Peter and Gwenda Dixon went missing during a walk in Pembrokeshire and were later found dead on a coastal path.

The Pembrokeshire Murders is based on this disturbing true story