Linda (Suranne Jones), an ex-cop turned sex therapist, is pulled into the seedy world of fetish and S&M when her ex-lover, Angie (Eva Pope), seeks her advice on a sordid murder case involving auto-erotic asphyxiation. When another body is discovered – this time one of Linda’s clients – both her professional and personal life is put at risk in this sizzling mini-series from Kay Mellor