Fourth film adaptation of Choderlos de Loclos's 1782 novel Les Liaisons Dangereuses takes the tale of seduction and intrigue from the 18th century French court to a modern Manhattan prep school. Think I Know Who You Did Last Summer. Gellar plays teen vamp Kathryn, who bets her step-brother Sebastian (Phillipe) a night of passion against his car that he can't deflower the virginal Annette (Witherspoon). The overall effect is like the characters' lives: full of guilty pleasures.