Cassie Stuart Haunts The First Trailer for 'Unforgotten' Season 5

The ghost of Nicola Walker's Cassie Stuart was always going to hang heavy over Unforgotten's fifth season, as the series attempts to carry on after Stuart's death via a car crash. It also doesn't help that Walker already jumped to a new series with Annika, the first season of which beat Unforgotten Season 5 to the punch in getting on the airwaves both in the U.K. and in the U.S. However, the new season takes advantage of both the on-screen grieving over the character's death and the audience's faithfulness to Walker by having her replacement, DCI Jessie James (Sinéad Keenan), fight for the respect of the team and the viewers.

The first trailer for the new season introduces the body before it brings in the new head of the cold case division, with a body up the chimney found after a housefire. As for the newly-promoted DI Sunny Khan (Sanjeev Bhaskar), whose new title didn't land him the head of Stuart's old team, it's a culture clash as his new boss is in no way the same as the old boss, and no one likes it. Season 5 clearly will be filled with divisional drama alongside the season's mystery body, as James and Khan butt heads over and over before they find their way to a new partnership.

As for the rest of the team, it seems like they picked a side before James ever stepped into the office, and it will take a while for anyone to warm up to the series' new lead.