Mary Sue Harper is the troubled stepdaughter of Senator <a href="/actor/dermot-mulroney">Bradley Weiner</a>, who finds himself embroiled in a fierce re-election campaign against his political rival <a href="/actor/kym-whitley">Anita Koch</a>. As their campaign heats up and scandals threaten to damage Bradley's reputation, he hatches a sinister plan with the help of his campaign manager, <a href="/actor/jake-busey">Wes</a>, and a shadowy black market dealer named Knox. Their scheme involves hiring an assassin to eliminate Mary Sue, making it appear as though her death is unrelated to Bradley’s political ambitions. His hope is that removing her from his life will not only stop her from causing further chaos in his career but also earn him sympathies from voters, giving him an electoral boost.
Despite her reputation for causing trouble and stirring up conflict in her stepfather's life, Mary Sue remains completely unaware of the treacherous plot against her and, interestingly, craves the love and attention that Bradley often neglects. When the first assassin arrives to carry out her killing, Mary Sue reacts with startling calmness and humor, even mistaking him for a prostitute. Her own unintentional act of self-defense results in her killing the assassin during what she thought was just a casual demonstration of her preferred kind of foreplay, which adds a darkly comic twist to the unfolding chaos.
As Bradley’s plan starts to unravel, Knox is tasked with sending more deadly operatives to finish the job. His next move involves deploying a highly trained military death squad. However, Mary Sue, relying surprisingly on skills she learned from playing video games, manages to outfight and kill the entire squad in a fierce shootout, showcasing her resilience and resourcefulness. Undeterred, Knox personally arrives at Bradley’s house to attempt the murder himself, but he is swiftly captured and humiliated, which only intensifies Bradley’s desperation. To prevent Knox from exposing the truth during interrogation, Bradley kills him and falsely blames the entire scheme on his rival, <a href="/actor/kym-whitley">Anita Koch</a>.
This revelation sparks a series of dangerous and emotional responses. Mary Sue, angered and suspicious, quickly contacts Anita, issuing death threats while her actions further arouse the suspicion of Bradley’s wife, <a href="/actor/michelle-gardner">Janine</a>. Meanwhile, a shocking secret comes to light—Carrie, the housekeeper played by <a href="/actor/michelle-gardner">Michelle Gardner</a>, is actually Svetlana, a covert KGB spy planted to gather intelligence on Bradley. Her ulterior motive is to leverage her knowledge to eliminate Mary Sue once and for all, in exchange for her loyalty to her espionage handlers.
Svetlana lures Mary Sue into the woods for a confrontation, attempting to kill her by tempting her into consuming drugs laced with a lethal fentanyl dose. When this plan fails, an intense shootout erupts, but Mary Sue once again emerges victorious with unexpected ease. The story takes a further twist as her mysterious overseas employer, Vladyslav <a href="/actor/french-stewart">Vladyslav Volkov</a>, reveals that he had trained Mary Sue as a brainwashed sleeper agent to do his bidding. However, in a bold move, she manages to break free from her mental conditioning and kills Vladyslav during the confrontation.
In the final moments, Bradley, desperately seeking reconciliation and control, tries to win Mary Sue’s loyalty, but she sees through his manipulations. Together with Janine, she chooses to reject Bradley’s toxic influence, leaving him behind — and it’s left ambiguous whether they ultimately decide to kill him or simply walk away. The story concludes with a news report indicating that Bradley has seemingly taken his own life, a possible end to his scandalous saga. Meanwhile, <a href="/actor/kym-whitley">Anita Koch</a> becomes the leading candidate for the Senate, though her own life mirrors the chaos—she struggles with her problematic child and discovers that her housekeeper remains a suspicious foreign agent, suggesting that the cycle of political and personal turmoil is far from over.
