In the small village of Clydach, Wales, a horrific crime shook the community to its core. One summer night in 1999, three generations of a family were brutally murdered, leaving a trail of devastation and unanswered questions. Despite a conviction, the case remains shrouded in mystery, with accusations of police misconduct and a community torn apart by suspicion and doubt. This four-part documentary series delves into the largest and most exhaustive criminal investigation in Welsh history, examining the case from multiple perspectives and uncovering new revelations that challenge everything we thought we knew about the events of that fateful night.

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Some TV shows that have similar genres and were produced around the same time as Murder In The Valleys include The Jinx: The Life and Deaths of Robert Durst, Spacey Unmasked, Hollywood Con Queen, Stalkers Who Kill, Quiet on Set: The Dark Side of Kids TV, Claimed and Shamed.