It is one of the most successful and highly anticipated crime dramas if recent years and millions of viewers will be glued to ITV on Monday night as the new series of Unforgotten continues.
Unforgotten first came into our lives in 2015, with ITV viewers swiftly hooked on the investigations of London detectives, DCI Cassie Stuart (Nicola Walker) and DI Sunny Khan (Sanjeev Bhaskar), as they solve cold cases of disappearance and murder.
After the first three series of Unforgotten proved to be a huge success, it was reported that filming on series 4 would commence in the autumn of 2019 but after it finally started in 2020, production was then put on hold due to the coronavirus pandemic.
Unforgotten series 5 will see the arrival of a new partner in crime for Sunny, in the shape of DCI Jessica 'Jess' James, played by Sinead Keenan. Sinead, who has appeared in the likes of Little Boy Blue and Show Trial, replaces much loved star Nicola Walker, whose character Cassie bowed out of the show in dramatic and tragic circumstances at the end of the last series.
What happened in Unforgotten series four?
DCI Cassie Stuart had been struggling with the demands of her job and things going on at home for much of series four, not least her father's early onset dementia and his alarming decision to change his will and leave his half of the house to his new girlfriend
And then, right at the end of the penultimate episode, Cassie left the police mortuary to head home but was struck by another car in scenes that left fans across the country sat bolt upright on their sofas.
They feared the worst as credits rolled and they were right to be concerned, as Cassie didn't pull through, with Nicola's on-screen alias killed off in brutal fashion,. after sustaining severe internal head injuries.
Aside from Cassie's shocking death, the crime plot to Unforgotten series four revolved around DCI Stuart's team launching an investigation after a body tumbled out of a freezer at a scrapyard. The headless, handless corpse is identified was as missing person Matthew Walsh, who had disappeared 30 years earlier, in 1990.
Detectives eventually found murder victim Walsh's mummified head and hands in a storage unit, with it being declared by a pathologist that it was a fountain pen being pushed into Walsh's skull that had been the cause of death.
The luxury pen, an expensive gift with a unique serial number was traced to Dean Barton, a passenger in a car that was stopped for drink driving at the same time Walsh was last seen.
Barton confessed that, having found Walsh unconscious, he rammed the pen into his head to 'finish him off' in an act of revenge for Walsh murdering his brother a year earlier.
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