Terri Fletcher (HILARY DUFF) is a 16-year-old high school student living in Flagstaff who dreams of being a singer one day. Her older brother Paul (JASON RITTER) thinks she's good enough to do just that. Accordingly, and unbeknownst to her, he sends a DVD showcasing her talents to the Bristol Hillman music school in Los Angeles where she hopes to attend a month-long summer workshop.
Unfortunately, her stern father, Simon (DAVID KEITH), refuses to let her go, much to the chagrin of his wife, Francis (RITA WILSON), and sister Nina (REBECCA DE MORNAY). Things then get more strained in the family when Paul is killed in a car accident on the night of his graduation from high school.
Riddled with guilt as she was the one who convinced him to sneak out of the house to attend a concert, Terri wants to give up singing, but when Bristol Hillman accepts her application, Francis insists that she go. With everyone lying to Simon about Terri spending the month with Nina in Palm Desert, the teen makes her way to the school. There, she meets Jay (OLIVER JAMES), a charming Brit who's tired of singer and ex-girlfriend Robin (LAUREN C. MAYHEW) hanging all over him.
Terri's roommate, violinist Denise (DANA DAVIS), is cold and standoffish toward her, as is the sullen pianist, Sloane (KAT DENNINGS), who's unaware that the nerdy but eager Kiwi (JOHNNY LEWIS) is interested in her. Under the tutelage of Mr. Torvald (JOHN CORBETT) and others, Terri begins her classes, but the memories of Paul's death continue to haunt her.
As the month progresses and she eventually befriends various students at the school while keeping up her lie to her dad, Terri tries to get over her grief and find her singing voice once again, all while competing for a $10,000 music scholarship to be handed out at the end of the summer session.