S04:É01 - S04:E01 - Rotherham
Emilia travels to Rotherham to undercover a double murder separated by two decades.
S04:É02 - S04:E02 - Swanley
In May 1996 the murder of Stephen Cameron hit newspaper headlines as one of the first examples of a Road Rage killing.
S04:É03 - S04:E03 - Glasgow
Emilia visits where Karen was last seen and learns about the investigation to try and find her.
S04:É04 - S04:E04 - Peterborough
Emilia visits Peterborough where in 1979 a young woman, Sally Ann McGrath, went missing having last been seen in the city centre.
S04:É05 - S04:E05 - Mablethorpe
Emilia travels to the seaside town of Mablethorpe to learn about the violent murders or Joan and John Stirland in 2004.
S04:É06 - S04:E06 - Blackburn
On the 24th October 2019 in Blackburn, Evie Adams was found dead in her home by her aunt.
S04:É07 - S04:E07 - Preston
Emilia visits Preston, and its suburb Ribbleton, to uncover the details around the tragic murder of 27-year-old mother of one Rosie Darbyshire.
S04:É08 - S04:E08 - Chatham
In 2018 Molly McClaren visited her local gym, where she was confronted by her ex-boyfriend.
S04:É09 - S04:E09 - Beenham
The village of Beenham was rocked by a series of murders between 1966 and 1967.
S04:É10 - S04:E10 - Birkenhead
In 2021 the body of Martin Decker was discovered in Birkenhead.