Disgraced detective DS Rose (Henry Lloyd-Hughes) has just been reinstated to the London police when he and his colleagues, newly promoted DI Baxter (Thalissa Teixeira) and young American ingenue, DC Edmunds (Lucy Hale) are called to a grim discovery in a block of flats. A 'Ragdoll' hangs from the ceiling, made up of six different body parts. When a hit list is released naming six more victims due to die, the team must race against time with the killer creating ever more ingenious methods to murder their victims. With a suspicious Edmunds looking into Rose's ever increasing erratic behaviour, Rose sets out on a secret investigation to find the killer before it's too late.