Klara serves in Syria in the French Army as an interpreter for "Opération Chammal". After the apprehension of a suspected terrorist, she witnesses the man's young son blow himself up at his father's behest with explosives hidden on his body. Traumatized by the blast and experiencing migraine headaches from it, she is transferred home to Nice and moves back in with her mother, Maria, and her sister, Tania, while serving in counter-terrorist operations as part of "Opération Sentinelle". On patrol, her trauma manifests itself in impulsive, sometimes disproportionally violent behavior towards suspects. The painkillers she was prescribed are not enough for her and she begins to buy more illegally.