The series can be dark and emotional, but not as violent as some.
Each of the four seasons of “Unforgotten” starts with the discovery of a long-buried body and the introduction of several seemingly unconnected characters going about their business in the present day. As DCI Cassie Stuart (Nicola Walker) and DI Sunny Khan (Sanjeev Bhaskar) of a London cold case unit start to investigate the people who were connected to the victim, it becomes clear over the course of each season how they’re interconnected and what led to the murder. Though the crimes are brutal, they’re far in the past and it’s the humanity of Cassie and Sunny that makes an impression, along with their struggles with family and work. The series can be dark and emotional, but not as violent as some.