Who's the real belle of the costume ball? Brandon Jones is one of the richest guys in Sweet Valley—and when Mandy Miller meets him at the Halloween costume ball at Lila Fowler's snooty country club, she falls head over heels in love. And so does Brandon! Only Brandon doesn't know he's fallen for Mandy. Her costume fools Brandon—he thinks Mandy is Lila. Mandy goes along with the deception. She can't bring herself to tell him she's not Lila. Mandy knows Brandon would never be caught with an ordinary girl like her. After the ball, the real masquerade begins. Brandon thinks he's in love with Lila, and Lila's pretending it was her all along! Will Brandon ever find out that it was Mandy behind the mask?