First episode in this new crime drama, starring Nicola Walker and Sanjeev Bhaskar as detectives investigating a cold-case killing from almost 40 years earlier. The discovery of a skeleton in the cellar of a demolished building launches a murder hunt, headed up by DCI Cassie Stuart (Walker) and DS Sunny Khan (Bhaskar). However, all they have to go on is a car key found near the body, which leads them on a search to find out who he is, as well as how, when and why he died. The all-star supporting cast includes Tom Courtenay, Trevor Eve, Bernard Hill, Ruth Sheen, Gemma Jones and Hannah Gordon.