In the exquisite landscape of pre-Revolution Paris, the cunning Marquise de Merteuil orchestrates a devious plot for revenge against her ex-lover, the Comte de Bastide, who has recently severed their relationship. To nurse her wounded pride and publicly humiliate Bastide, she delicately plans to seduce and disgrace his young and innocent fiancée, Cécile de Volanges. Cécile, who has only just been introduced to society after a sheltered upbringing in a convent, becomes the focal point of Merteuil's machinations.
To carry out her calculating scheme, Merteuil enlists the aid of Vicomte de Valmont, a former lover with equally dubious morals. However, Valmont initially hesitates, absorbed in a relentless pursuit to seduce Madame de Tourvel, the piously devoted wife of a Parliament member and a current guest at Valmont’s aunt Madame de Rosemonde's residence. In a twist of irony that highlights Valmont's arrogance, Merteuil raises the stakes considerably: if Valmont can indeed manage to entice Madame de Tourvel and provide written proof of his conquest, she will be inclined to indulge him as well. Taking up the challenge, Valmont eagerly accepts this opportunity.
Despite Valmont’s relentless charms, Madame de Tourvel spurns his advances with firm resolve. In a quest for leverage, Valmont instructs his page, Azolan, to seduce Tourvel's maid, Julie, thereby gaining access to Tourvel’s intimate correspondences. It is through one of these intercepted letters—from Cécile's mother, Madame de Volanges, who is also a cousin of Merteuil—that Tourvel is alerted to the deceptive nature of Valmont, describing him as untrustworthy. This revelation ignites Valmont's ambition to seduce Cécile as a form of revenge against her mother’s accurate assessment of him.
At an opera performance, Cécile's charm draws the attention of the dashing Chevalier Raphael Danceny, who takes on the role of her music tutor. Their budding romance blossoms under the sly influences of Merteuil, who knows well that Danceny, despite being noble and gallant, lacks the status and wealth to be considered a worthy suitor for Cécile.
Seizing an opportunity cloaked in a misleading pretext, Valmont gains access to Cécile’s private quarter, culminating in a horrific encounter where he sexually assaults her. As she pleads for him to stop, he casts a shadow of blackmail upon her, forcing her into submission. Following this traumatic incident, Cécile confines herself to her room under the guise of illness, while Madame de Volanges, worried for her daughter, enlists Merteuil to check on Cécile. Believing that Merteuil has her best interests in mind, Cécile opens up to her about her struggles. In an insidious manner, Merteuil advocates for Cécile to accept Valmont's advances, claiming that young women should seize all romantic opportunities amid a society rife with oppression and scorn towards women. This manipulation leads to a troubling dynamic where Cécile finds herself in a dual existence—courted by Danceny by daylight, but subjected to night-time “lessons” with Valmont.
Things take a darker turn when, after spending a night with Valmont, Cécile suffers a miscarriage. Meanwhile, Valmont finds himself genuinely falling for Madame de Tourvel, a stark departure from his notorious playboy ways. In a fit of jealousy, Merteuil rebukes Valmont and denies her end of their agreement unless he severs ties with Tourvel. Valmont, in a moment of emotional turmoil, harshly dismisses Tourvel with the callous remark: > "It's beyond my control." Overcome by despair and mortification, Tourvel retreats to a monastery, where her health rapidly declines.
Even with the severance of their connection, Merteuil sweetly maintains her scheming ways, going so far as to declare “war.” She betrays Valmont by revealing to Danceny that Valmont has been entangled with Cécile. This revelation instigates a confrontation, leading Danceny to challenge Valmont to a duel. In a tragic turn of events, Valmont chooses to end his own life by impaling himself on Danceny's sword. With his last breath, Valmont implores Danceny to communicate his love to Tourvel, but also warns him about Merteuil's malicious schemes, entrusting him with a collection of intimate letters as irrefutable proof of her treachery.
Upon receiving Valmont's sincerest message from Danceny, Tourvel's fragile heart gives in, leading to her untimely demise. Merteuil attends the opera, immersed in the glamour of Parisian society, only to depart in humiliation after being publicly scorned by those who once adored her, signifying that the chilling extent of her malevolence and ambition has been laid bare for all of Paris to see, thanks to Danceny’s dissemination of Valmont’s letters.
