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In September, 1935, two tourists make a gruesome discovery on the banks of a Scottish stream. When the police arrive, they know immediately that there’s been a brutal murder. But catching the killer won’t be easy, as they have used meticulous, surgical-like precision to hide their victims’ identities and cover their tracks.

Iain takes a look at a case that came to be known as The Jigsaw Murders – and delves into the pioneering forensic techniques that helped bring the killer to justice.

Murder They Wrote with Laura Whitmore and Iain Stirling is available weekly on ³ÉÈË¿ìÊÖ Sounds. Subscribe now so you never miss an episode. Email us at lauraandiain@bbc.co.uk.

Details of help and support with domestic abuse are available at bbc.co.uk/actionline.

A warning that this episode contains some violent scenes and scenes that some listeners may find upsetting.