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This episode follows two shocking criminal cases in Yorkshire, each involving a woman murdered by her partner, and two expert witnesses with very different disciplines in forensic science who help to deliver justice.

Crime scene investigations are often thought of as being about the DNA left behind in traces of blood, hair or skin cells at the site of an attack, but in the first story, it was the site itself, the natural environment, that provided the biggest clue to detectives. A young woman went missing in Hull, and despite an emotional appeal by her partner, he soon became a chief suspect in the missing woman鈥檚 case. But suspecting who the perpetrator of a crime might be is one thing; proving beyond reasonable doubt that the suspect was responsible is another. Police asked for help from Patricia Wiltshire, a forensic ecologist. The partner of the missing woman initially claimed he had killed her by mistake but couldn't remember where he had buried her body. Patricia was given access to his car and footwear, and was able to use her botany skills to pinpoint where the body of the missing woman was and help prove it was murder.

And in Melsonby, analysis of blood spatter found at a crime scene revealed the truth behind a husband鈥檚 lies. A woman was found dead in the home she shared with her husband above a post office. Her husband claimed that she had been held hostage, but this didn鈥檛 fit the time frame. The police asked Jo Millington, an expert in blood spatter analysis, for help. Jo showed that the direction of blood at the crime scene meant there may never have been a break in, and the husband was convicted of murder.