Six people have been murdered, dismembered and sewn into the shape of one grotesque body suspended from the ceiling in a block of London flats - nicknamed the 'Ragdoll.' Assigned to the shocking case are newly reinstated DS Nathan Rose (Lloyd-Hughes); his best friend and boss, DI Emily Baxter (Teixeira); and the unit's new recruit, DC Lake Edmunds (Hale). The 'Ragdoll Killer' taunts the police by sending them a list of his next victims, with Rose's name among them. And with those victims to protect, our heroes soon come under intense public scrutiny.