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In the trailer for Unforgotten - Season 1, the body of a teenage boy who went missing 39 years earlier has been found. Even though the murder took place a long time ago, London detectives DCI Cassie Stuart (Nicola Walker) and DS Sunil Khan (Sanjeev Bhaskar) are determined to find who killed him. However, their prime suspects, most of whom are now elderly, claim not to remember anything.