The eight-part series is once again set in contemporary London and the new series unfolds in the unique style of Rosenfeldt's Nordic style. Interweaving storylines and characters from all different walks of life and backgrounds will lead the audiences on a complex and emotional journey and keep them guessing until the very end.The story begins with the discovery of a body inside a wall. The body is surrounded by toys and soft animals and a school blazer; a devastated Marcella soon works out that the body is that of schoolboy Leo Priestley, who was abducted a few years beforehand and a friend of Marcella's son, Edward.A task-force is quickly pulled together by newly promoted DCI, Tim and we are introduced to a new member of the team, LeAnn. In one of the first meetings, she stands up for Marcella – something that she is not used to within the workplace.As the investigation progresses, we're introduced to a number of new characters – an old pop star Reg and his manager and friend Alan; edgy businessman Vince Whitman and his charity boss wife Maya; a previously convicted criminal Phil Dawkins; brother and sister Gail and Eric; and Becky, the new fiancée of Marcella's ex-husband.Whilst the storylines entwine, Marcella is still battling with her ongoing sporadic fugue states which she struggles to come to terms with and is getting increasingly worried about the effects it is having on her and her family around her.