The series begins with a woman who has been brutally stabbed in her home in Leeds. Over the course of the critical next few hours the teams and blood-analysis experts meticulously assess the scene to establish what might have happened and report back to the detectives investigating the case.

A close range shotgun attack in a West Yorkshire newsagents sends tremors through the community. Forensic teams must assess the evidence and help the prosecution pursue the case to court.

A recycling plant in Yorkshire is the scene of a gruesome discovery when an intact human foot is found among the waste. Who does it belong to? Is it a murder case? And who's responsible?