Unforgotten Season 4 (2015)

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Unforgotten is a British crime drama that features two London detectives, DCI Cassie Stuart and DI Sunny Khan, solving cold cases rooted in disappearance or murder. Each series is based around a single case involving people that do not seem to play a factor at first. However, connections are steadily revealed as more information is learned and the emotional aftermath is explored in full. Every case begins with the remains of the victim being discovered in some fashion.