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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 warn about the police investigation. And manageress Laurie returns home to care for her aging mum - unaware that two shady figures are watching her every move.
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Pizza shop manager Laurie visits Jane to confess guilt for sending Abdullah to his death but disappears shortly afterwards whilst the police find wads of notes at her flat, leading to Mikey's arrest for drug dealing from his work-place. Army captain Sandrine Shaw, after seeing psychiatrist Xan Schofield for post traumatic stress counselling, makes a cryptic phone call which intrigues her bullying CO Dyson. Kip interviews Abdullah's sisters at an immigration detention centre along with racist MI5 agent Sam Spence. They give nothing away but Kip is sure they are hiding something.
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Sandrine is increasingly fraught. Peter Westbourne tracks her down, but fails to calm her. Sandrine returns to the army base, retrieves her gun and disappears. Faced with a second murder, Kip and Nathan struggle to figure out how the two killings are connected. Kip is convinced that MI5 is leaking information to the media.
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A group of people smugglers is arrested whilst David argues with his leader over her immigration policy and Sandrine confronts Dyson's wife with the fact that he is a rapist before setting out on one last mission. Kip interviews Spence's mole, Berna, who gives her the name of the smugglers' boss. As Kip tracks down Sandrine Jane and the Mars contemplate their futures and there is closure of a sort.
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