Mia is the fourteen-year-old stepsister of Cammie Sheppard and the stepdaughter of Clark Sheppard. She comes to live in their Beverly Hills mansion in the book and is originally from the Valley. Cammie is disgusted with how unrefined Mia is and how she acts so classless. Mia smokes marijuana twice in the book and ends up drunk at a party. Cammie finds Mia with an older man in an alley and comes to her rescue and later admits to Adam Flood that even though Mia annoys her, she feels protective of her.
