Drama exploring the spiraling repercussions surrounding the fatal shooting of a pizza delivery man. Set over the course of four days, the story centers on Detective Inspector Kip Glaspie, who refuses to accept that the murder is a random act of senseless violence and becomes determined to discover if there is a darker truth. Politician David Mars instantly is embroiled in the drama through his turbulent relationship with his troubled and unpredictable ex, Karen. All the while, Jane Oliver, a compassionate vicar, struggles to conceal her affair with the only witness to the crime.
In South London a young man, Abdullah Asif, is shot dead delivering a pizza.
The detective in charge, DI Kip Glaspie, quickly discovers that the pizza manager Laurie Stone, inexplicably sent Syrian refugee Abdullah instead of regular driver Mikey Gowans. At the crime scene, KIP dismisses pushy reporter Robert Walsh, and is briefed by her partner DS Nathan Bilk.
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 arrives to comfort his ex-wife Karen, the customer of the fatal pizza delivery.
Bereaved sisters Mona and Fatima are processed at Harsfleet detention centre. Sandrine returns to her army desk job, under the threatening gaze of Major Dyson, and works through her troubled past in Afghanistan with therapist Xan. Pizza manager Laurie has gone missing. Searching Laurie's home, a fatigued Kip discovers a hidden stash of cash.
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.