Nicola Walker and Sanjeev Bhaskar are back for season 4 of Unforgotten, which has just started production in the UK. Although Cassie wanted to retire after the events of season 3, turns out her pension is in jeopardy, so she grudgingly returns to work. Soon enough, the team finds remains of a dismembered body in a scrap metal yard, and after identifying him, tracks down 4 of the people who were with him on the night he went missing. Seems like they are sticking to the formula that has worked for them thus far. Looking forward to it!