Malicious wealthy teenager Kathryn finds herself with a step-brother when her mother remarries, but discovers the new addition to the family shares her love of manipulating and seducing other people. They work together to torment the other pupils at their exclusive prep school. Drama prequel, starring Amy Adams and Robin Dunne.

After his precocious behavior has gotten him bounced out of one more in a string of exclusive private schools, 16-year old Sebastian Valmont has arrived in New York City to live with his father and stepmother. The cunning and handsome Sebastian may have met his match, however in his equally manipulative and beautiful stepsister Kathryn Merteuil.