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The gripping series returns with the case of a multi-generation murder in Wales. It took years to bring the killer to justice - had they been hiding within the police's own ranks?

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

Stefan Kiszko was convicted of murder when 11-year-old Lesley Molseed was found dead on the Yorkshire Moors. Sixteen years later he was declared innocent, so who did kill Lesley?

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 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 evidence suggesting that a man with a twisted fetish was on the loose and could kill again.