In September 1992, 14-year-old Misty Copsey goes to the Washington State Fair with her best friend. Misty doesn’t make it home that night, and she is never seen again. Police initially deem her a runaway. Misty’s mom, Diana, insists they are wrong. Five months later, a search party finds a potential clue: a pair of jeans, socks and underwear crumpled along the side of a highway. Diana recognizes the jeans immediately, but the police are skeptical. More than 30 years later, through multiple investigations, no other trace of Misty has ever been found. How does a young girl disappear into thin air?And how could investigators fail to pursue leads that were right under their noses? In this captivating new series from ID, cold case investigator Sarah Cailean works through anonymous tips, interviews with Misty’s family and friends, police records, and media reports in an attempt to get to the bottom of whether Misty’s disappearance is the work of a serial killer or that of someone who knew Misty. Sarah won’t stop until she answers a question that’s haunted western Washington for more than three decades: Who Took Misty Copsey?

Also, go back and listen to Season 1, "Why Can't We Talk About Amanda's Mom?" and Season 2, "Who Killed Jennifer Judd?"

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