Karl finds himself in Folkestone's seedy underbelly, while Elise heads to Boulogne to investigate threats made to Marie Villeneuve and makes a grisly discovery in a deserted slaughterhouse. In England, reporter Danny Hillier receives another phone call from the killer, who targets a care home where Stephen Beaumont's sister Suze (Keeley Hawes) has been stealing painkillers from resident Harriet Stone (Liz Smith). Stephen Dillane and Clemence Poesy star.