Focusing on the case of a multi-generation murder that happened in Wales, where it took years to finally bring the killer to justice.

After 19-year-old Cassandra McDermott is found dead in her London home, her family endure a cruel waiting game as their only hope for justice is if the murderer tries to kill again.

When 11-year-old Lesley Molseed was found dead on the Yorkshire Moors, Stefan Kiszko was convicted of her murder. Sixteen years later he was declared innocent.

On the tenth anniversary of Vikki Thompson's brutal murder in the Thames Valley, a new lead emerges that results in the case being re-opened.

When 77-year-old Georgina Edmonds is murdered in her Hampshire cottage, the community believes that the killer must be an outsider, but the police are baffled by a series of dead ends.

The sadistic murder of Wendy Speakes shocked the city of Wakefield, with the evidence strongly suggesting that a murderer with a twisted fetish was on the loose and could kill once again.