Trace of Evil - Season 1

December 2000: 19-year-old Rachel Manning was murdered in Milton Keynes. Two men were wrongfully convicted, but new advances in forensics proved that evil always leaves a trace...

Attacking in broad daylight, the M25 Rapist became synonymous with fear and triggered one of the biggest manhunts in British history.

This episode tells the story of how the Pittsburgh Police Force and the FBI raced against time to locate missing 13-year-old Alicia Kozakiewicz. Abducted by 38-year-old Scott Tyree, Alicia was raped and tortured over a number of days, however law enforcement harnessed cyber forensics to locate her whereabouts and bring her home.

This episode tells the story of how the Boston State Police and the National Centre for Missing and Exploited Children came together to identify the remains of a child found dumped in a plastic bag, and how they brought the perpetrator to justice.

This episode explores one of the longest running and most dedicated investigations in modern British history. It tracks the advances in forensic technology that eventually led to the murders being solved, finally giving justice to the victims' families after 37 years.

This episode tells the story of how a most unlikely killer was stopped in his tracks as he embarked on a crime and murder spree, thanks to digital forensics, police work and a good old-fashioned stake-out.

When women start to go missing, the city of Baton Rouge goes into lock-down. Investigators and family members work together to find that illusive trace of evil.

Just as Baton Rouge starts to feel safe they discover a second serial killer is at work. But when he leaves a trace at a scene, the police get an unexpected breakthrough.