This episode was first published last August.

When Alex Campbell suggested to his high school sociology class that they would be investigating a 40-year-old cold case, he had no idea where it would lead. Within a year, a serial killer had been identified. In his next class, they decided to try and overturn a wrongful conviction. And they did. So just how did Mr. Campbell breed a class of super sleuths?

This podcast was brought to you thanks to the support of readers of The Times and The Sunday Times. Subscribe today: http://thetimes.com/thestory

Guest: Harriet Alexander, Senior Features Reporter, The Times and The Sunday Times.

Host: Luke Jones.

Producer: Taryn Siegel.

Clips: WBIR Channel 10, NewsNation, WKRN News 2.

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