In the summer after 8th grade, with high school looming before them, four teenage girls (Vega, Boorem, Taylor-Compton, Childress) have a slumber party at Julie's (Vega) house which ends up being one of the most eventful nights of their lives thus far. The party becomes an adventure when they end up competing against a group of "popular girls" (Larson, Paxton) (with the prize being the cafeteria's "best" table) in an all-night scavenger hunt that sends them out into the city, "borrowing" Julie's dad's (Garlin) car, sneaking into clubs, having their first kisses and trying to do all this without Julie's mom (Lynch) knowing they even left the house.