In South London a young man, Abdullah Asif (Sam Otto), is shot dead delivering a pizza. The detective in charge, DI Kip Glaspie (Carey Mulligan), quickly discovers that the pizza manager Laurie Stone (Hayley Squires), inexplicably sent Syrian refugee Abdullah instead of regular driver Mikey Gowans (Brian Vernel). At the crime scene, KIP dismisses pushy reporter Robert Walsh (Mark Umbers), and is briefed by her partner DS Nathan Bilk (Nathanial Martello-White). The killing seems professional, but the only witness - a young woman strung out on drugs on the street corner - gives the police a false name and address. Local MP David Mars (John Simm) arrives to comfort his ex-wife Karen (Billie Piper), the customer of the fatal pizza delivery. Kip and Nathan track down Abdullah's home, a set of garages, to find his sisters, Fatima (Ahd Kamel) and Mona (July Namir). The sisters are scared and Kip's convinced they're hiding something. Meanwhile Mikey takes a beating from two men he tries to ...