In 1979, a young woman went missing, having last been seen in the city centre. The police assumed Sally Ann McGrath had simply run away, and it took nearly eight months for her to be found. We learn from the police officer who led the cold case review, about a three-decade-long investigation aimed at catching a dangerous individual. Murdertown returns for a fourth season, this time hosted by award-winning actress Emilia Fox. In each episode, Emilia will visit towns and local communities throughout the country rocked by murder and tragedies, from which the scars persist to this day. Through the testimony of investigating police officers, local journalists, friends and relatives, the series re-tells these shocking incidents and how the lives of those directly affected will never be the same again.