Her sister Susan's arrival in Beverly Hills further complicates Anna's life, with Ben still mooning over her, Adam wanting more than friendship, an internship in her father's girlfriend's new company, and a class project that brings her in close contact with Sam, Cassie, and Dee.

Seventeen-year-old blueblood Anna Percy leaves Manhattan to spend the second half of her senior year with her father in Los Angeles and quickly becomes involved in the lives of the rich and famous at Beverly Hills High School.

When she joins her sister on the West Coast at their father's, Anna begins to understand that telling true love from true lust is far more easily said than done.

As prom approaches, Anna, Cammie, Sam, and their friends try to deal with their insecurities about their bodies and their relationships, and one of them discovers a shocking secret about her mother's death.