Thomas Hargrove was an investigative reporter when he had an idea: use open-source FBI data to spot patterns in unsolved murders. That idea became an algorithm that highlights locations where serial killers might be operating. In this episode, Thomas talks us through the cases it’s uncovered and why data can reveal what people miss.

Visit Thomas' organisation the Murder Accountability Project at www.murderdata.org.

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The Man Using Maths to Find Serial Killers