1935. Up in the picturesque hills of Moffat, Scotland, a gruesome discovery is made. Beneath an old bridge, a humble country police constable stands amid human body parts. The public will soon be as mystified as they are shocked, and the case will be dubbed The Jigsaw Murders. Those body parts will form the building blocks of 'the first modern murder investigation', going on to define criminal forensics itself. But under that bridge, horror strewn around his feet, the constable asks himself the question: Who could do something like this?

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