When Becca finally figures out the secret location of the ninth graders's annual bash, she spills the top secret information to Kerry, who doesn't stop blabbing until everyone in the eighth grade knows. To salvage her reputation, Becca plans a new bash at her vacationing uncle's empty house. But Becca's older sister Ellen also decides to take advantage of the empty house and plans a date with her boyfriend for the same afternoon as Becca's party. Tucker, who's been grounded by his dad, sneaks out to warn Becca that her sister is on the way, but by the time he arrives, the party is already completely out of control.