A prequel based on the 1999 theatrical film "Cruel Intentions," a modern-day version of Choderlos De Laclos' 18th century novel "Dangerous Liaisons." Manchester, a prestigious New York prep school, provides the backdrop to sex, scandal and betrayal among the Upper East Side's teenage elite. Sebastian Valmont has just moved in with his philandering father's Manhattan family. A unique sibling rivalry is borne between Sebastian and his new step-sister Kathryn. As he shuns her attempts to impress him with money and power, he resists the growing attraction between them. Meanwhile, the manipulative Kathryn and her cohorts, a secret society called the Manchester Tribunal, plot to control the destiny of all who cross their path, including Cecile, a naive freshman. Sebastian must choose between joining the underground group or falling for Annette, the headmaster's daughter and Kathryn's nemesis.