During the summer of 1999, a group of teenagers, through interconnected narratives, live through their last day of high school and prepare for the future. Holly (Alexa Vega), once the new girl in school, does whatever it takes to remain popular. Dawn (Lyndsy Fonseca), who is secretly a lesbian, battles drugs. Tori (Leighton Meester) is the valedictorian of her class, but, on the eve of graduation, she decides to experiment with drugs for the first time.