Mia Thermopolis is turning fifteen, and her birthday promises to be perfect: the whole family at the table, Michael by her side, and his graduation party on the horizon. But one awkward incident at the restaurant turns the celebration into chaos and sets off a chain of events that leads to a massive strike — many New York cafes and hotels shut down.
Now not only the graduation is at risk, but also Mia's entire usual world. The situation is worsened by new challenges: her mom is preparing for the arrival of a baby, her relationship with her best friend Lilly is cracking, and a summer trip to Genovia looms ahead, a summer that was supposed to be special — after all, it’s Michael's last summer before college.
Can Mia save the graduation, restore her lost friendship, and, in her dream pink dress, spend a magical evening with Michael?