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.
Elenco: Nathaniel Martello-White , Hayley Squires , Carey Mulligan , Nicola Walker , Ben Miles , John Simm , Billie Piper , Orla Brady , Jeany Spark , Kae Alexander , Nicola Duffett , Nick Mohammed .