Fifteen-year-old Cynthia Lopez made a promise to her dying father: she will live with her two stepsisters, Ami and Lila, until she turns 25, at which point she'll inherit his large estate. Now, nine years later, twenty-four-year-old Cyn is counting down the days to that fateful birthday. At first, living with Ami and Lila had been fun, even exciting at times. Two of New York's hottest It-Girls, they know all the right people, own all the right things, and go to all the right parties. Sensible Cyn used to be content hiding in the shadows of her larger-than-life sisters. Now, Cyn is finally wising up and realizing that she is no longer stepsister to the stars--she is personal assistant/slave to the stars (or Las Diablas, as the Latin press likes to call them). And, when Prince Charming enters, Cyn must go head-to-head with her truly wicked stepsisters in order to win back her father's fortune, her perfect man, and, most importantly, her life.