In the sun-drenched, seemingly perfect suburb of Crestview, Millie, portrayed by Anya Taylor-Joy, lives a life of curated boredom and quiet desperation. Her world is one of manicured lawns and stifling predictability, until a moment of shocking, impulsive violence shatters the calm forever. With a chilling lack of motive, Millie shoots and kills a man, an act she commits not out of rage or revenge, but simply for fun. This single, senseless event sends her spiraling into a dangerous game of cat and mouse, as a dogged detective, played by John Boyega, begins to piece together the unsettling truth. The film unfolds as a tense psychological thriller, blending dark satire with nerve-wracking suspense as it explores the terrifying banality of evil lurking behind a perfect smile. Millie must navigate the growing suspicion and the unraveling of her own carefully constructed facade, all while questioning whether her act was a one-time diversion or the awakening of something far more sinister.