The disappearance of the Lyon sisters from a mall in Montgomery County in 1975 shocked the public and mystified police. Four decades later, an overlooked tip led police to a new suspect - Lloyd Welch. Clip: “What they learned to do with Lloyd, over time, was to ignore the stories that he told them, but to pay attention to the little details in those stories that kept recurring, no matter how often or how dramatically he changed his account.” [16 sec] Mark Bowden’s latest book, The Last Stone, describes how detectives sorted through Welch’s elaborate explanations. We hear how Bowden covered the story as a rookie reporter for the Baltimore News-American and what he thinks lies behind the popularity of the true crime genre.

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