When an exclusive clique of teenage socialites accidentally murders their best friend, Liz (Charlotte Ayanna), on the morning of her birthday, the three girls responsible -- Courtney (Rose McGowan), Julie (Rebecca Gayheart) and Marcie (Julie Benz) -- conspire to hide the truth. As the trio make over nerdy reject Fern Mayo (Judy Greer) and groom her to take Liz's place, crack police Detective Vera Cruz (Pam Grier) launches an investigation that will turn Reagan High School upside down.