In the bustling backdrop of New York City, Sebastian Valmont, played by Ryan Phillippe, is a wealthy teen renowned for his charm and manipulative prowess, effortlessly ensnaring women in his web of seduction. However, he's grown weary of the repetitive game and sets out on a new quest to find someone worthy who can challenge his skills. His gaze lands on Annette Hargrove, portrayed by Reese Witherspoon, the principled daughter of the headmaster at his new school, who has openly stated that she desires nothing less than true love.
Alongside him is his equally cunning stepsister Kathryn Merteuil, played by Sarah Michelle Gellar, who also has her own agenda. When Sebastian proposes a bet—if he fails to seduce Annette, Kathryn will take his treasured vintage Jaguar XK140, but if he succeeds, she will finally yield to his desires—the stakes are raised. Meanwhile, Kathryn seeks revenge against her ex-boyfriend Court Reynolds, who has moved on with the innocent Cecile Caldwell. To enact her plan, Kathryn manipulates Sebastien into leading Cecile to fall for Ronald Clifford, a kind-hearted music teacher.
Sebastian initially struggles with his mission as Annette has been forewarned of his notorious reputation. He suspects that football player Greg is behind the rumors and blackmails him to clear his name in Annette's eyes. As Sebastian dives deeper into his scheme, he discovers that it was Cecile's mother who tipped off Annette about his charming facade. In an attempt at retribution, he decides to expose Cecile's crush on Ronald and persuades Ronald to write her a love letter—a ploy to lure Cecile into his bedroom.
With Kathryn's assistance, Cecile becomes increasingly daring, leading to a plot where she is to seduce Sebastian. However, as Sebastian spends more time with Annette, he begins to form genuine feelings for her, drawn to her authenticity and laughter. Although he attempts to kiss her, she resists, fearing a loss of control around him. In a moment of self-awareness, Sebastian confronts Annette on her hypocrisy, realizing both of them harbor deep feelings yet are entangled in their fears. Annette eventually gives in, but Sebastian’s confusion leads him to push her away.
In a twist of fate, Annette decides to leave, prompting Sebastian to pursue her, where he confesses his true emotions, igniting a passionate connection between the two. As Kathryn’s manipulation over Sebastian weakens, she threatens him, warning that revealing his true feelings to Annette would ruin their reputations. This deception weighs heavy on Annette, leaving her devastated by Sebastian’s betrayal. Despite his best efforts to mend his relationship with Kathryn, he finds himself dismissed repeatedly.
However, Kathryn's manipulations run deeper than mere bets; she reveals her true intent to destroy Sebastian’s spirit and pride in loving Annette. In a climactic turn, Sebastian attempts to reconcile with Annette, only to be met with rejection. Undeterred, he leaves her an apology and a glimpse into his soul through his journal, which ultimately exposes Kathryn's manipulative tactics to the world.
As the truth comes to light, Kathryn finds herself on precarious ground, facing the wrath of those she has wronged. With tensions escalating, Ronald confronts Sebastian in a fit of rage. In the ensuing chaos, Annette is nearly injured, but Sebastian heroically pushes her out of harm's way, only to be struck by a taxi in the process.
In the poignant moments leading up to his death, Sebastian and Annette profess their love for one another—a heartbreaking testament to the consequences of Kathryn's cruelty. At Sebastian's funeral, Kathryn’s eulogy falls short, overshadowed by the crowd's support for Cecile, who hands out copies of Sebastian’s journal, aptly titled Cruel Intentions.
The pages within provide a damning portrayal of Kathryn’s heartlessness, showcasing her vices and underhanded strategies. As her carefully crafted image collapses under public scrutiny, Kathryn is left to mourn the destruction of her own doing. In a final, heartfelt scene, Annette drives away in Sebastian’s car, wearing his sunglasses and holding tightly to his journal—a powerful reminder of their love and the cruel fate that has entwined their lives.
