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In the series, the investigator has been newly demoted from Robbery-Homicide after clashing with her male partner and has been reassigned to head up the underfunded cold case unit, supervising a staff of reserves and volunteers.

For almost six decades, Headley evaded justice for the crime before cold case detectives at Avon and Somerset Police sent items for forensic analysis last year - resulting in a DNA match.

Louisa Dunne's case is thought to be the UK's longest-running cold case to be solved.

The case is thought to be the UK's longest-running cold case to be solved.

Police believe Mrs Dunne's murder is the oldest cold case ever to be solved in the UK.