Frankie, a driven and accomplished woman in her forties, thrives in the aerospace sector at Filton, where she designs military surveillance drones. Unmarried and in full command of her life, her strongest bond is with her father, a former Concorde engineer. However, her world is turned upside down when she begins a fervent romance with Kahil, a French-Algerian aerospace student two decades her junior. Her routine is shattered when she is unexpectedly detained at work by security services, as Kahil has caught the attention of MI5. As suspicion and bias seep into her life, Frankie finds herself torn between her intense emotions and the growing doubts that cloud her judgment.