In the picturesque Lewis Clark Valley, a series of unsettling disappearances in the late 1970s and early 1980s leaves families shattered and a community in shock. Despite the efforts of dedicated detective Jackie Nichols, the case goes cold. Decades later, Jackie reopens the investigation, tracking down witnesses and pursuing leads. With the help of Gloria Bobertz, a determined amateur sleuth and victim's family member, they uncover a trail of dead bodies linked to a single suspect. But without concrete evidence, the suspect remains a free man. Will Jackie and Gloria bring justice to their small town or will a serial killer continue to evade capture? "Cold Valley" is a gripping documentary series that follows a community's quest for truth and a detective's relentless pursuit of justice.

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Some TV shows that have similar genres and were produced around the same time as Cold Valley include The Jinx: The Life and Deaths of Robert Durst, American Nightmare, Welcome To Murdertown, Hell House, 72 Hours: True Crime, Til Death Do Us Part.